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97
Combination of Measurements of Inclusive Deep Inelastic $e^{\pm}p$ Scattering Cross Sections and QCD Analysis of HERA Data
lun., 22 juin 2015 03:13:32 GMT | 1377206
DESY-15-039
arXiv:1506.06042
by: Abramowicz, H. (Tel Aviv U.) et al.
Abstract:
A combination is presented of all inclusive deep inelastic cross sections previously published by the H1 and ZEUS collaborations at HERA for neutral and charged current $e^{\pm}p$ scattering for zero beam polarisation. The data were taken at proton beam energies of 920, 820, 575 and 460 GeV and an electron beam energy of 27.5 GeV. The data correspond to an integrated luminosity of about 1 fb$^{-1}$ and span six orders of magnitude in negative four-momentum-transfer squared, $Q^2$, and Bjorken $x$. The correlations of the systematic uncertainties were evaluated and taken into account for the combination. The combined cross sections were input to QCD analyses at leading order, next-to-leading order and at next-to-next-to-leading order, providing a new set of parton distribution functions, called HERAPDF2.0. In addition to the experimental uncertainties, model and parameterisation uncertainties were assessed for these parton distribution functions. Variants of HERAPDF2.0 with an alternative gluon parameterisation, HERAPDF2.0AG, and using fixed-flavour-number schemes, HERAPDF2.0FF, are presented. The analysis was extended by including HERA data on charm and jet production, resulting in the variant HERAPDF2.0Jets. The inclusion of jet-production cross sections made a simultaneous determination of these parton distributions and the strong coupling constant possible, resulting in $\alpha_s(M_Z)=0.1183 \pm 0.0009 {\rm(exp)} \pm 0.0005{\rm (model/parameterisation)} \pm 0.0012{\rm (hadronisation)} ^{+0.0037}_{-0.0030}{\rm (scale)}$. An extraction of $xF_3^{\gamma Z}$ and results on electroweak unification and scaling violations are also presented.Vector spectral functions and transport properties in quenched QCD
mar., 26 mai 2015 17:03:00 GMT | 1373104
PoS LATTICE2014 (2015) 216
by: Ding, Heng-Tong (Hua-Zhong Normal U., LQLP) et al.Exploring the QCD phasediagram with conserved charge fluctutaions
mar., 26 mai 2015 17:00:26 GMT | 1373070
PoS LATTICE2014 (2015) 186
by: Schmidt, Christian (Bielefeld U.)
Abstract:
We analyze cumulants of fluctuations of baryon number, electric charge and strangeness on the lattice, using highly improved staggered fermions and almost realistic quark masses. In particular we review the current stage of the sixth order fluctuations and discuss how higher order cumulants are related to the scaling behavior of QCD in the chiral limit. We argue that unlike the second and forth order cumulants, the sixth order cumulants receive a sizable contribution from the singular part of the free energy. Extracting this singular part can be helpful for the analysis of the QCD phase diagram and critical behavior.Oscillation of heavy sterile neutrino in decay of $B \to \mu e \pi$
mar., 19 mai 2015 04:39:32 GMT | 1370714
USM-TH-335
arXiv:1505.04749
by: Cvetic, Gorazd (Santa Maria U., Valparaiso) et al.
Abstract:
In a scenario with two almost mass degenerate heavy sterile Majorana neutrinos with a mass $\sim 1$ GeV, we present the semileptonic decay widths of heavy charged pseudoscalars such as $B$ mesons, either lepton-number-violating (LNV: $B^{\pm} \to \mu^{\pm} e^{\pm} \pi^{\mp}$), or lepton-number-conserving (LNC: $B^{\pm} \to \mu^{\pm} e^{\mp} \pi^{\pm}$), mediated by such on-shell neutrinos. It had been explained in the literature that such decays may be eventually detected, and that they can present even detectable CP violation effects. In this work we point out that, in addition, such decays may present detectable effects of heavy neutrino oscillation, allowing us to extract the oscillation length and thus the heavy neutrino mass difference $\Delta M_N$, as well as a CP-violating Majorana phase.Discretization effects in $N_c=2$ QCD and Random Matrix Theory
lun., 18 mai 2015 02:30:08 GMT | 1370443
arXiv:1505.03911
by: Kieburg, Mario (Bielefeld U.) et al.
Abstract:
We summarize the analytical solution of the Chiral Perturbation Theory for the Hermitian Wilson Dirac operator of $N_c=2$ QCD with quarks in the fundamental representation. Results have been obtained for the quenched microscopic spectral density, the distribution of the chiralities over the real modes and the chiral condensate. The analytical results are compared with results from a Monte Carlo simulation of the corresponding Random Matrix Theory.Dirac Spectrum of the Wilson Dirac Operator for QCD with Two Colors
ven., 08 mai 2015 06:48:22 GMT | 1367309
arXiv:1505.01784
by: Kieburg, Mario (SUNY, Stony Brook) et al.
Abstract:
We study the lattice artefacts of the Wilson Dirac operator for QCD with two colors and fermions in the fundamental representation from the viewpoint of chiral perturbation theory. These effects are studied with the help of the following spectral observables: the level density of the Hermitian Wilson Dirac operator, the distribution of chirality over the real eigenvalues, and the chiral condensate for the quenched as well as for the unquenched theory. We provide analytical expressions for all these quantities. Moreover we derive constraints for the level density of the real eigenvalues of the non-Hermitian Wilson Dirac operator and the number of additional real modes. The latter is a good measure for the strength of lattice artefacts. All computations are confirmed by Monte Carlo simulations of the corresponding random matrix theory which agrees with chiral perturbation theory of two color QCD with Wilson fermions.Isolated singularities of affine special K\"ahler metrics in two dimensions
mar., 05 mai 2015 02:39:11 GMT | 1366056
arXiv:1505.00462
by: Haydys, Andriy (Bielefeld U.)
Abstract:
We prove that there are just two types of isolated singularities of special K\"ahler metrics in real dimension two provided the associated holomorphic cubic form does not have essential singularities. We also construct examples of such metrics.Thermodynamics of strong-interaction matter from Lattice QCD
mer., 22 avril 2015 02:45:43 GMT | 1362492
arXiv:1504.05274
by: Ding, Heng-Tong (Hua-Zhong Normal U., LQLP) et al.
Abstract:
We review results from lattice QCD calculations on the thermodynamics of strong-interaction matter with emphasis on input these calculations can provide to the exploration of the phase diagram and properties of hot and dense matter created in heavy ion experiments. This review is organized as follows: 1) Introduction, 2) QCD thermodynamics on the lattice, 3) QCD phase diagram at high temperature, 4) Bulk thermodynamics, 5) Fluctuations of conserved charges, 6) Transport properties, 7) Open heavy flavors and heavy quarkonia, 8) QCD in external magnetic fields, 9) Summary.European Pulsar Timing Array Limits On An Isotropic Stochastic Gravitational-Wave Background
jeu., 16 avril 2015 02:33:22 GMT | 1359767
arXiv:1504.03692
by: Lentati, L. (Cambridge U.) et al.
Abstract:
We present new limits on an isotropic stochastic gravitational-wave background (GWB) using a six pulsar dataset spanning 18 yr of observations from the 2015 European Pulsar Timing Array data release (Desvignes et al. in prep.). Performing a Bayesian analysis, we fit simultaneously for the intrinsic noise parameters for each pulsar in this dataset, along with common correlated signals including clock, and Solar System ephemeris errors to obtain a robust 95$\%$ upper limit on the dimensionless strain amplitude $A$ of the background of $A<3.0\times 10^{-15}$ at a reference frequency of $1\mathrm{yr^{-1}}$ and a spectral index of $13/3$, corresponding to a background from inspiralling super-massive black hole binaries, constraining the GW energy density to $\Omega_\mathrm{gw}(f)h^2 < 1.1\times10^{-9}$ at 2.8 nHz. We show that performing such an analysis when fixing the intrinsic noise parameters for the individual pulsars leads to an erroneously stringent upper limit, by a factor $\sim 1.7$. We obtain a difference in the logarithm of the Bayesian evidence between models that include either a correlated background, or uncorrelated common red noise of $-1.0 \pm 0.5$, indicating no support for the presence of a correlated GWB in this dataset. We discuss the implications of our analysis for the astrophysics of supermassive black hole binaries, and present 95$\%$ upper limits on the string tension, $G\mu/c^2$, characterising a background produced by a cosmic string network for a set of possible scenarios, and for a stochastic relic GWB. For a Nambu-Goto field theory cosmic string network, we set a limit $G\mu/c^2<1.3\times10^{-7}$, identical to that set by the Planck Collaboration, combining Planck and high-$\ell$ Cosmic Microwave Background data from other experiments. (Abridged)Evading the sign problem in the mean-field approximation through Lefschetz-thimble path integral
mar., 14 avril 2015 02:50:36 GMT | 1359295
RIKEN-QHP-183
BI-TP-2015-07
YITP-15-26
RIKEN-STAMP-2
arXiv:1504.02979
Phys.Rev. D91 (2015) 101701
by: Tanizaki, Yuya (Tokyo U.) et al.
Abstract:
The fermion sign problem appearing in the mean-field approximation is considered, and the systematic computational scheme of the free energy is devised by using the Lefschetz-thimble method. We show that the Lefschetz-thimble method respects the reflection symmetry, which makes physical quantities manifestly real at any order of approximations using complex saddle points. The formula is demonstrated through the Airy integral as an example, and its application to the Polyakov-loop effective model of dense QCD is discussed in detail.The Spin Structure Function $g_1^{\rm p}$ of the Proton and a Test of the Bjorken Sum Rule
mer., 01 avril 2015 02:52:18 GMT | 1357198
arXiv:1503.08935
by: Adolph, C. (Erlangen - Nuremberg U.) et al.
Abstract:
New results for the double spin asymmetry $A_1^{\rm p}$ and the proton longitudinal spin structure function $g_1^{\rm p}$ are presented. They were obtained by the COMPASS collaboration using polarised 200 GeV muons scattered off a longitudinally polarised NH$_3$ target. The data were collected in 2011 and complement those recorded in 2007 at 160\,GeV, in particular at lower values of $x$. They improve the statistical precision of $g_1^{\rm p}(x)$ by about a factor of two in the region $x\lesssim 0.02$. A next-to-leading order QCD fit to the $g_1$ world data is performed. It leads to a new determination of the quark spin contribution to the nucleon spin, $\Delta \Sigma$ ranging from 0.26 to 0.36, and to a re-evaluation of the first moment of $g_1^{\rm p}$. The uncertainty of $\Delta \Sigma$ is mostly due to the large uncertainty in the present determinations of the gluon helicity distribution. A new evaluation of the Bjorken sum rule based on the COMPASS results for the non-singlet structure function $g_1^{\rm NS}(x,Q^2)$ yields as ratio of the axial and vector coupling constants $|g_{\rm A}/g_{\rm V}| = 1.22 \pm 0.05~({\rm stat.}) \pm 0.10~({\rm syst.})$, which validates the sum rule to an accuracy of about 9\%.Critical point and scale setting in SU(3) plasma: An update
ven., 20 mars 2015 04:03:50 GMT | 1353545
arXiv:1503.05652
Phys.Rev. D91 (2015) 096002
by: Francis, A. (York U., Canada) et al.
Abstract:
We explore a method developed in statistical physics which has been argued to have exponentially small finite-volume effects, in order to determine the critical temperature Tc of pure SU(3) gauge theory close to the continuum limit. The method allows us to estimate the critical coupling βc of the Wilson action for temporal extents up to Nτ∼20 with ≲0.1% uncertainties. Making use of the scale setting parameters r0 and t0 in the same range of β-values, these results lead to the independent continuum extrapolations Tcr0=0.7457(45) and Tct0=0.2489(14), with the latter originating from a more convincing fit. Inserting a conversion of r0 from literature (unfortunately with much larger errors) yields Tc/ΛMS¯=1.24(10).Complex saddle points in finite-density QCD
mar., 03 mars 2015 03:50:52 GMT | 1346967
arXiv:1503.00060
by: Nishimura, Hiromichi (Bielefeld U.) et al.
Abstract:
We consider complex saddle points in QCD at finite temperature and density, which are constrained by symmetry under charge and complex conjugations. This approach naturally incorporates color neutrality, and the Polyakov loop and the conjugate loop at the saddle point are real but not identical. Moreover, it can give rise to a complex mass matrix associated with the Polyakov loops, reflecting oscillatory behavior in color-charge densities. This aspect of the phase structure appears to be sensitive to the origin of confinement, as modeled in the effective potential.Recent progress in hard-thermal-loop QCD thermodynamics and collective excitations
mar., 17 févr. 2015 04:01:25 GMT | 1345036
BI-TP-2015-08
arXiv:1502.04589
Int.J.Mod.Phys. A30 (2015) 1530025
by: Su, Nan (Bielefeld U.)
Abstract:
I review recent developments in QCD thermodynamics and collective excitations from the hard-thermal-loop effective theory. I begin by motivating the discussion with open questions from heavy-ion collisions. I then discuss a finite-temperature and -density calculation of QCD thermodynamics at NNLO from the hard-thermal-loop perturbation theory. Finally I discuss a recent exploration of generalizing the hard-thermal-loop framework to the (chromo)magnetic scale $g^2T$, from which a novel massless mode is uncovered.Cosmology challenges brane scenarios in AdS5
ven., 13 févr. 2015 14:17:37 GMT | 1344453
by: Konikowska, Dominika (Bielefeld U.)
Abstract:
We study a theory of dilaton gravity in a 5D brane scenario, with the dilaton nonminimally coupled to the matter content of the universe localized on the brane. We investigate whether the observed large-scale structure of the universe can exist on the brane in the effective 4D dilaton gravity model with an exact anti de Sitter bulk. The corresponding constraint on the spatial derivative of the matter energy density is derived, and subsequently quantified using the current limits resulting from searches for variation of Newton's constant. By confronting it with the observational data from galaxy surveys, we show that the derived bound does not allow for the existence of the large-scale structure as is observed today. Thus, such a dilaton gravity brane scenario is ruled out.The smallest eigenvalue distribution in the real Wishart–Laguerre ensemble with even topology
ven., 13 févr. 2015 03:35:32 GMT | 1344214
arXiv:1502.03685
J.Phys. A48 (2015) 245202
by: Wirtz, Tim (Duisburg-Essen U.) et al.
Abstract:
We consider rectangular random matrices of size $p\times n$ belonging to the real Wishart-Laguerre ensemble also known as the chiral Gaussian orthogonal ensemble. This ensemble appears in many applications like QCD, mesoscopic physics, and time series analysis. We are particularly interested in the distribution of the smallest non-zero eigenvalue and the gap probability to find no eigenvalue in an interval $[0,t]$. While for odd topology $\nu=n-p$ explicit closed results are known for finite and infinite matrix size, for even $\nu>2$ only recursive expressions in $p$ are available.The smallest eigenvalue distribution as well as the gap probability for general even $\nu$ is equivalent to expectation values of characteristic polynomials raised to a half-integer. The computation of such averages is done via a combination of skew-orthogonal polynomials and bosonisation methods. The results are given in terms of Pfaffian determinants both at finite $p$ and in the hard edge scaling limit ($p\to\infty$ and $\nu$ fixed) for an arbitrary even topology $\nu$. Numerical simulations for the correlated Wishart ensemble illustrate the universality of our results in this particular limit. These simulations point to a validity of the hard edge scaling limit beyond the invariant case.Lattice QCD Thermodynamics with Physical Quark Masses
mar., 10 févr. 2015 03:45:03 GMT | 1343518
arXiv:1502.02296
by: Soltz, R.A. (LLNL, Livermore) et al.
Abstract:
Over the past few years new physics methods and algorithms as well as the latest supercomputers have enabled the study of the QCD thermodynamic phase transition using lattice gauge theory numerical simulations with unprecedented control over systematic errors. This is largely a consequence of the ability to perform continuum extrapolations with physical quark masses. Here we review recent progress in lattice QCD thermodynamics, focussing mainly on results that benefit from the use of physical quark masses: the crossover temperature, the equation of state, and fluctuations of the quark number susceptibilities. In addition, we place a special emphasis on calculations that are directly relevant to the study of relativistic heavy ion collisions at RHIC and the LHC.Hawking-Unruh hadronization and strangeness production in high energy collisions
lun., 09 févr. 2015 03:34:25 GMT | 1343336
arXiv:1502.01938
EPJ Web Conf. 97 (2015) 00009
by: Castorina, P. (Catania U.) et al.
Abstract:
The interpretation of quark ($q$)- antiquark ($\bar q$) pairs production and the sequential string breaking as tunneling through the event horizon of colour confinement leads to a thermal hadronic spectrum with a universal Unruh temperature, $T \simeq 165$ Mev,related to the quark acceleration, $a$, by $T=a/2\pi$. The resulting temperature depends on the quark mass and then on the content of the produced hadrons, causing a deviation from full equilibrium and hence a suppression of strange particle production in elementary collisions. In nucleus-nucleus collisions, where the quark density is much bigger, one has to introduce an average temperature (acceleration) which dilutes the quark mass effect and the strangeness suppression almost disappears.Gravitational collapse of thin shells: Time evolution of the holographic entanglement entropy
jeu., 05 févr. 2015 05:09:09 GMT | 1342957
arXiv:1502.01277
JHEP 1506 (2015) 126
by: Keranen, Ville (Oxford U., Theor. Phys.) et al.
Abstract:
We study the dynamics of gravitationally collapsing massive shells in AdS spacetime, and show in detail how one can determine extremal surfaces traversing them. The results are used to solve the time evolution of the holographic entanglement entropy in strongly coupled dual conformal gauge theory, which is is seen to exhibit a regime of linear growth independent of the shape of the boundary entangling region and the equation of state of the shell. Our exact results are finally compared to those of two commonly used approximation schemes, the Vaidya metric and the quasistatic limit, whose respective regions of validity are quantitatively determined.The Legacy of Rolf Hagedorn: Statistical Bootstrap and Ultimate Temperature
ven., 30 janv. 2015 03:46:28 GMT | 1342017
BI-TP-2015-09
arXiv:1501.07523
by: Redlich, Krzysztof (Wroclaw U.) et al.
Abstract:
In the latter half of the last century, it became evident that there exists an ever increasing number of different states of the so-called elementary particles. The usual reductionist approach to this problem was to search for a simpler infrastructure, culminating in the formulation of the quark model and quantum chromodynamics. In a complementary, completely novel approach, Hagedorn suggested that the mass distribution of the produced particles follows a self-similar composition pattern, predicting an unbounded number of states of increasing mass. He then concluded that such a growth would lead to a limiting temperature for strongly interacting matter. We discuss the conceptual basis for this approach, its relation to critical behavior, and its subsequent applications in different areas of high energy physics.Exploring the properties of the phases of QCD matter - research opportunities and priorities for the next decade
mar., 27 janv. 2015 07:31:07 GMT | 1341047
arXiv:1501.06477
by: Heinz, Ulrich (Ohio State U.) et al.
Abstract:
This document provides a summary of the discussions during the recent joint QCD Town Meeting at Temple University of the status of and future plans for the research program of the relativistic heavy-ion community. A list of compelling questions is formulated, and a number of recommendations outlining the greatest research opportunities and detailing the research priorities of the heavy-ion community, voted on and unanimously approved at the Town Meeting, are presented. They are supported by a broad discussion of the underlying physics and its relation to other subfields. Areas of overlapping interests with the "QCD and Hadron Structure" ("cold QCD") subcommunity, in particular the recommendation for the future construction of an Electron-Ion Collider, are emphasized. The agenda of activities of the "hot QCD" subcommunity at the Town Meeting is attached.Quarkonium Binding and Entropic Force
lun., 19 janv. 2015 03:43:57 GMT | 1339633
BI-TP-2015-04
arXiv:1501.03940
Eur.Phys.J. C75 (2015) 193
by: Satz, Helmut (Bielefeld U.)
Abstract:
A $Q{\bar{Q}}$ bound state represents a balance between repulsive kinetic and attractive potential energy. In a hot quark–gluon plasma, the interaction potential experiences medium effects. Color screening modifies the attractive binding force between the quarks, while the increase of entropy with $Q{\bar{Q}}$ separation gives rise to a growing repulsion. We study the role of these phenomena for in-medium $Q{\bar{Q}}$ binding and dissociation. It is found that the relevant potential for $Q{\bar{Q}}$ binding is the free energy $F$ , with increasing $Q{\bar{Q}}$ separation, further binding through the internal energy $U$ is compensated by repulsive entropic effects.Order $g^2$ susceptibilities in the symmetric phase of the Standard Model
jeu., 15 janv. 2015 03:41:13 GMT | 1339259
BI-TP-2014-25
arXiv:1501.03151
JCAP 1504 (2015) 040
by: Bödeker, D. (Bielefeld U.) et al.
Abstract:
Susceptibilities of conserved charges such as baryon minus lepton number enter baryogenesis computations, since they provide the relationship between conserved charges and chemical potentials. Their next-to-leading order corrections are of order g, where g is a generic Standard Model coupling. They are due to soft Higgs boson exchange, and have been calculated recently, together with some order g(2) corrections. Here we compute the complete g(2) contributions. Close to the electroweak crossover the soft Higgs contribution is of order g(2), and is determined by the non-perturbative physics at the magnetic screening scale.Confining forces
mer., 07 janv. 2015 03:40:34 GMT | 1336634
BI-TP-2014-26
arXiv:1501.01127
by: Rollmann, Dirk (Bielefeld U.) et al.
Abstract:
We discuss the forces on the internal constituents of the hadrons based on the bag model. The ground state of the hadrons forms a color singlet so that the effects of the colored internal states are neutralized. From the breaking of the dilatation and conformal symmetries under the strong interactions the corresponding currents are not conserved. These currents give rise to the forces changing the motion of the internal particles which causes confinement.Gravitational wave astronomy with the SKA
lun., 05 janv. 2015 03:39:41 GMT | 1336039
arXiv:1501.00127
PoS AASKA14 (2015) 037
by: Janssen, Gemma (ASTRON, Dwingeloo) et al.
Abstract:
On a time scale of years to decades, gravitational wave (GW) astronomy will become a reality. Low frequency (nanoHz) GWs are detectable through long-term timing observations of the most stable pulsars. Radio observatories worldwide are currently carrying out observing programmes to detect GWs, with data sets being shared through the International Pulsar Timing Array project. One of the most likely sources of low frequency GWs are supermassive black hole binaries (SMBHBs), detectable as a background due to a large number of binaries, or as continuous or burst emission from individual sources. No GW signal has yet been detected, but stringent constraints are already being placed on galaxy evolution models. The SKA will bring this research to fruition. In this chapter, we describe how timing observations using SKA1 will contribute to detecting GWs, or can confirm a detection if a first signal already has been identified when SKA1 commences observations. We describe how SKA observations will identify the source(s) of a GW signal, search for anisotropies in the background, improve models of galaxy evolution, test theories of gravity, and characterise the early inspiral phase of a SMBHB system. We describe the impact of the large number of millisecond pulsars to be discovered by the SKA; and the observing cadence, observation durations, and instrumentation required to reach the necessary sensitivity. We describe the noise processes that will influence the achievable precision with the SKA. We assume a long-term timing programme using the SKA1-MID array and consider the implications of modifications to the current design. We describe the possible benefits from observations using SKA1-LOW. Finally, we describe GW detection prospects with SKA1 and SKA2, and end with a description of the expectations of GW astronomy.Kinetic freeze-out from an anisotropic fluid in high-energy heavy-ion collisions: particle spectra, Hanbury Brown–Twiss radii, and anisotropic flow
jeu., 18 déc. 2014 03:49:10 GMT | 1334704
BI-TP-2014-024
arXiv:1412.5199
Eur.Phys.J. C75 (2015) 275
by: Borghini, Nicolas (Bielefeld U.) et al.
Abstract:
Dissipative relativistic fluid-dynamical descriptions of the extended fireball formed in high-energy heavy-ion collisions are quite successful, yet require a prescription for converting the fluid into particles. We present arguments in favour of using a locally anisotropic momentum distribution for the particles emitted from the fluid, so as to smooth out discontinuities introduced by the usual conversion prescriptions. Building on this ansatz, we investigate the effect of the asymmetry on several observables of heavy ion physics.The Bayesian reconstruction of the in-medium heavy quark potential from lattice QCD and its stability
jeu., 13 nov. 2014 04:53:04 GMT | 1327488
arXiv:1411.3141
by: Burnier, Yannis (ITPP, Lausanne) et al.
Abstract:
We report recent results of a non-perturbative determination of the static heavy-quark potential in quenched and dynamical lattice QCD at finite temperature. The real and imaginary part of this complex quantity are extracted from the spectral function of Wilson line correlators in Coulomb gauge. To obtain spectral information from Euclidean time numerical data, our study relies on a novel Bayesian prescription that differs from the Maximum Entropy Method. We perform simulations on quenched $32^3\times N_\tau$ $(\beta=7.0,\xi=3.5)$ lattices with $N_\tau=24,...,96$, which cover $839{\rm MeV} \geq T\geq 210 {\rm MeV}$. To investigate the potential in a quark-gluon plasma with light u,d and s quarks we utilize $N_f=2+1$ ASQTAD lattices with $m_l=m_s/20$ by the HotQCD collaboration, giving access to temperatures between $286 {\rm MeV} \geq T\geq 148{\rm MeV}$. The real part of the potential exhibits a clean transition from a linear, confining behavior in the hadronic phase to a Debye screened form above deconfinement. Interestingly its values lie close to the color singlet free energies in Coulomb gauge at all temperatures. We estimate the imaginary part on quenched lattices and find that it is of the same order of magnitude as in hard-thermal loop perturbation theory. From among all the systematic checks carried out in our study, we discuss explicitly the dependence of the result on the default model and the number of datapoints.Phase Diagram of Wilson and Twisted Mass Fermions at finite isospin chemical potential
mar., 11 nov. 2014 05:27:12 GMT | 1326931
arXiv:1411.2570
PoS LATTICE2014 (2015) 065
by: Kieburg, M. (Bielefeld U.) et al.
Abstract:
Wilson Fermions with untwisted and twisted mass are widely used in lattice simulations. Therefore one important question is whether the twist angle and the lattice spacing affect the phase diagram. We briefly report on the study of the phase diagram of QCD in the parameter space of the degenerate quark masses, isospin chemical potential, lattice spacing, and twist angle by employing chiral perturbation theory. Moreover we calculate the pion masses and their dependence on these four parameters.Equation of State for QCD at finite temperature and density. Resummation versus lattice data
jeu., 06 nov. 2014 04:50:35 GMT | 1326159
arXiv:1411.1253
by: Andersen, Jens O. (Norwegian U. Sci. Tech.) et al.
Abstract:
The perturbative series for finite-temperature field theories has very poor convergence properties and one needs a way to reorganize it. In this talk, I review two ways of reorganizing the perturbative series for field theories at finite temperature and chemical potential, namely hard-thermal-loop perturbation theory (HTLpt) and dimensional reduction (DR). I will present results for the pressure, trace anomaly, speed of sound and the quark susceptibilities from a 3-loop HTLpt calculation and for the quark susceptibilities using DR at four loops. A careful comparison with available lattice data shows good agreement for a number of physical quantities.Problems with Ultrahigh-energy Neutrino Interactions
mar., 04 nov. 2014 05:00:50 GMT | 1325840
arXiv:1411.0498
by: Schildknecht, Dieter (Bielefeld U.)
Abstract:
The IceCube collaboration has recently identified events due to ultrahigh-energy neutrino interactions. Predictions of the neutrino-nucleon cross section at ultrahigh energies require a huge extrapolation of the cross sections experimentally measured at laboratory energies. Upon relating neutrino scattering to deep inelastic electron scattering, we show that the empirically verified color dipole picture is well suited for such an extrapolation. The dominant contribution to the total neutrino-nucleon cross section, even at ultrahigh energies, is due to the kinematic range where color transparency is valid for the color dipole interaction. We deviate from various claims in the literature on the presence of screening effects due to non-linear evolution at ultrahigh neutrino energies.The in-medium heavy quark potential from quenched and dynamical lattice QCD
mar., 28 oct. 2014 04:56:25 GMT | 1324386
arXiv:1410.7311
PoS LATTICE2014 (2015) 220
by: Burnier, Yannis (Ecole Polytechnique, Lausanne) et al.
Abstract:
We present our latest results for the the complex valued static heavy-quark potential at finite temperature from lattice QCD. The real and imaginary part of the potential are obtained from the position and width of the lowest lying peak in the spectral function of the Wilson line correlator in Coulomb gauge. Spectral information is extracted from Euclidean time data using a novel Bayesian approach different from the Maximum Entropy Method. In order to extract both the real and imaginary part, we generated anisotropic quenched lattices $32^3\times N_\tau$ $(\beta=7.0,\xi=3.5)$ with $N_\tau=24,\ldots,96$, corresponding to $839{\rm MeV} \geq T\geq 210 {\rm MeV}$. For the case of a realistic QCD medium with light u, d and s quarks we use isotropic $48^3\times12$ ASQTAD lattices with $m_l=m_s/20$ provided by the HotQCD collaboration, which span $286 {\rm MeV} \geq T\geq 148{\rm MeV}$. We find a clean transition from a confining to a Debye screened real part and observe that its values lie close to the color singlet free energies in Coulomb gauge. The imaginary part, estimated on quenched lattices, is found to be of the same order of magnitude as in hard-thermal loop (HTL) perturbation theory.Scalar field collapse with negative cosmological constant
mer., 15 oct. 2014 04:04:23 GMT | 1322082
arXiv:1410.3495
Class.Quant.Grav. 32 (2015) 135021
by: Baier, R. (Bielefeld U.) et al.
Abstract:
The formation of black holes or naked singularities is studied in a model in which a homogeneous time-dependent scalar field with an exponential potential couples to four dimensional gravity with negative cosmological constant. An analytic solution is derived and its consequences are discussed. The model depends only on one free parameter, which determines the equation of state and decides the fate of the spacetime. Without fine tuning the value of this parameter the collapse ends in a generic formation of a black hole or a naked singularity. The latter case violates the cosmic censorship conjecture.Static quark-antiquark potential in the quark-gluon plasma from lattice QCD
ven., 10 oct. 2014 03:41:29 GMT | 1321390
BI-TP-2014-21
arXiv:1410.2546
Phys.Rev.Lett. 114 (2015) 082001
by: Burnier, Yannis (Ecole Polytechnique, Lausanne) et al.
Abstract:We present a state-of-the-art determination of the complex valued static quark-antiquark potential at phenomenologically relevant temperatures around the deconfinement phase transition. Its values are obtained from nonperturbative lattice QCD simulations using spectral functions extracted via a novel Bayesian inference prescription. We find that the real part, both in a gluonic medium, as well as in realistic QCD with light
Continuum estimate of the heavy quark momentum diffusion coefficient $\kappa$
lun., 15 sept. 2014 02:48:30 GMT | 1316337
BI-TP-2014-16
arXiv:1409.3724
Nucl.Phys. A931 (2014) 633-637
by: Kaczmarek, Olaf (Bielefeld U.)
Abstract:
Among quantities playing a central role in the theoretical interpretation of heavy ion collision experiments at RHIC and LHC are so-called transport coefficients. Out of those heavy quark diffusion coefficients play an important role e.g. for the analysis of the quenching of jets containing c or b quarks (D or B mesons) as observed at RHIC and LHC. We report on a lattice investigation of heavy quark momentum diffusion within pure SU(3) plasma above the deconfinement transition with the quarks treated to leading order in the heavy mass expansion. We measure the relevant colour-electric Euclidean correlator and based on several lattice spacings perform the continuum extrapolation. This extends our previous studies progressing towards a removal of lattice artifacts and a physical interpretation of the results. We find that the correlation function clearly exceeds its perturbative counterpart which suggests that at temperatures just above the critical one, non-perturbative interactions felt by the heavy quarks are stronger than within the weak-coupling expansion. Using an Ansatz for the spectral function which includes NNLO perturbative contributions we were able to determine, for the first time, a continuum estimate for the heavy quark momentum diffusion coefficient.In-medium meson properties and screening correlators
ven., 12 sept. 2014 15:44:41 GMT | 1316270
J.Phys.Conf.Ser. 535 (2014) 012031
by: Bazavov, A. (Brookhaven) et al.
Abstract:
We study spatial meson correlation functions consisting of strange quarks, strange and charm quarks and charm quarks in (2 + 1)-flavor QCD using the highly improved staggered quark action. We find that the in-medium modification of the meson correlators decreases with increasing charm quark content and decreasing size. In particular, we find strong in-medium modification of phi and D(s) meson correlators around the chiral transition temperature T(c), while J/ψ and η(c) correlators show strong in-medium modification only at temperatures of 1.4T(c).Hadron Freeze-Out and Unruh Radiation
jeu., 11 sept. 2014 03:43:19 GMT | 1315839
BI-TP-2014-18
arXiv:1409.3104
by: Castorina, Paolo (Catania U.) et al.
Abstract:
We consider hadron production in high energy collisions as an Unruh radiation phenomenon. This mechanism describes the production pattern of newly formed hadrons and is directly applicable at vanishing baryochemical potential, mu = 0. It had already been found to correctly yield the hadronisation temperature, T_h = sqrt(sigma / 2 pi) = 165 MeV in terms of the string tension sigma. Here we show that the Unruh mechanism also predicts hadronic freeze-out conditions, giving s/T_h^3 = 3 pi^2 / 4 = 7.4 in terms of the entropy density s and E/N = \sqrt(2 pi sigma) = 1.09 for the average energy per hadron. These predictions provide a theoretical basis for previous phenomenological results and are also in accord with recent lattice studies.Boltzmann hierarchy for interacting neutrinos I: formalism
lun., 08 sept. 2014 02:48:57 GMT | 1315278
arXiv:1409.1577
JCAP 1504 (2015) 016
by: Oldengott, Isabel M. (Bielefeld U.) et al.
Abstract:
Starting from the collisional Boltzmann equation, we derive for the first time and from first principles the Boltzmann hierarchy for neutrinos including interactions with a scalar particle. Such interactions appear, for example, in majoron-like models of neutrino mass generation. We study two limits of the scalar mass: (i) An extremely massive scalar whose only role is to mediate an effective 4-fermion neutrino-neutrino interaction, and (ii) a massless scalar that can be produced in abundance and thus demands its own Boltzmann hierarchy. In contrast to, e.g., the first-order Boltzmann hierarchy for Thomson-scattering photons, our interacting neutrino/scalar Boltzmann hierarchies contain additional momentum-dependent collision terms arising from a non-negligible energy transfer in the neutrino-neutrino and neutrino-scalar interactions. This necessitates that we track each momentum mode of the phase space distributions individually, even if the particles were massless. Comparing our hierarchy with the commonly used (c(eff)(2),c(vis)(2))-parameterisation, we find no formal correspondence between the two approaches, which raises the question of whether the latter parameterisation even has an interpretation in terms of particle scattering. Lastly, although we have invoked majoron-like models as a motivation for our study, our treatment is in fact generally applicable to all scenarios in which the neutrino and/or other ultrarelativistic fermions interact with scalar particles.HISQ inverter on Intel$\scriptsize{^{\circledR}}$ Xeon Phi$\scriptsize{^{TM}}$ and NVIDIA$\scriptsize{^{\circledR}}$ GPUs
ven., 05 sept. 2014 03:30:33 GMT | 1315118
arXiv:1409.1510
PoS LATTICE2014 (2015) 044
by: Mukherjee, Swagato (Brookhaven) et al.
Abstract:
The runtime of a Lattice QCD simulation is dominated by a small kernel, which calculates the product of a vector by a sparse matrix known as the "Dslash" operator. Therefore, this kernel is frequently optimized for various HPC architectures. In this contribution we compare the performance of the Intel Xeon Phi to current Kepler-based NVIDIA Tesla GPUs running a conjugate gradient solver. By exposing more parallelism to the accelerator through inverting multiple vectors at the same time we obtain a performance 250 GFlop/s on both architectures. This more than doubles the performance of the inversions. We give a short overview of both architectures, discuss some details of the implementation and the effort required to obtain the achieved performance.Collins and Sivers asymmetries in muonproduction of pions and kaons off transversely polarised protons
mer., 20 août 2014 03:58:29 GMT | 1311491
CERN-PH-EP-2014-213
arXiv:1408.4405
Phys.Lett. B744 (2015) 250-259
by: Adolph, C. (Erlangen - Nuremberg U.) et al.
Abstract:
Measurements of the Collins and Sivers asymmetries for charged pions and charged and neutral kaons produced in semi-inclusive deep-inelastic scattering of high energy muons off transversely polarised protons are presented. The results were obtained using all the available COMPASS proton data, which were taken in the years 2007 and 2010. The Collins asymmetries exhibit in the valence region a non-zero signal for pions and there are hints of non-zero signal also for kaons. The Sivers asymmetries are found to be positive for positive pions and kaons and compatible with zero otherwise.A 24-Hour Global Campaign To Assess Precision Timing of the Millisecond Pulsar J1713+0747
lun., 11 août 2014 12:07:08 GMT | 1310230
arXiv:1408.1694
Astrophys.J. 794 (2014) 21
by: Dolch, T. (Cornell U., Astron. Dept.) et al.
Abstract:
The radio millisecond pulsar J1713+0747 is regarded as one of the highest-precision clocks in the sky and is regularly timed for the purpose of detecting gravitational waves. The International Pulsar Timing Array Collaboration undertook a 24 hr global observation of PSR J1713+0747 in an effort to better quantify sources of timing noise in this pulsar, particularly on intermediate (1-24 hr) timescales. We observed the pulsar continuously over 24 hr with the Arecibo, Effelsberg, GMRT, Green Bank, LOFAR, Lovell, Nançay, Parkes, and WSRT radio telescopes. The combined pulse times-of-arrival presented here provide an estimate of what sources of timing noise, excluding DM variations, would be present as compared to an idealized $\sqrt{N}$ improvement in timing precision, where N is the number of pulses analyzed. In the case of this particular pulsar, we find that intrinsic pulse phase jitter dominates arrival time precision when the signal-to-noise ratio of single pulses exceeds unity, as measured using the eight telescopes that observed at L band/1.4 GHz. We present first results of specific phenomena probed on the unusually long timescale (for a single continuous observing session) of tens of hours, in particular interstellar scintillation, and discuss the degree to which scintillation and profile evolution affect precision timing. This paper presents the data set as a basis for future, deeper studies.Intriguing Relations Between the LECs of Wilson $\chi $-PT and Spectra of the Wilson Dirac Operator
mer., 23 juil. 2014 15:25:12 GMT | 1307350
Acta Phys.Polon.Supp. 7 (2014) 625
by: Kieburg, Mario (Bielefeld U.) et al.
Abstract:
We discuss the behavior of the spectral densities of the non-Hermitian Wilson Dirac operator. Moreover, we derive compact relations between the leading order LECs of Wilson -PT and observables that can be measured by a lattice simulation. These relations can be used to determine the LECs from lattice simulationsTriple Higgs Coupling as a Probe of the Twin-Peak Scenario
mar., 22 juil. 2014 03:28:04 GMT | 1307100
BI-TP-2014-15
arXiv:1407.5283
Phys.Lett. B743 (2015) 279-283
by: Ahriche, Amine (Jijel U.) et al.
Abstract:
In this letter, we investigate the case of a twin peak around the observed 125 GeV scalar resonance, using di-Higgs production processes at both LHC and $e^{+}e^{-}$ Linear Colliders. We have shown that both at LHC and Linear Collider the triple Higgs couplings play an important role to identify this scenario; and also that this scenario can be distinguishable from any Standard Model extension by extra massive particles which might modify the triple Higgs coupling. We also introduce a criterion that can be used to ruled out the twin peak scenario.Probing the finite density equation of state of QCD via resummed perturbation theory
mer., 09 juil. 2014 04:19:52 GMT | 1305293
arXiv:1407.2191
by: Mogliacci, Sylvain (Bielefeld U.)
Abstract:
In this Ph.D. thesis, the primary goal is to present a recent investigation of the finite density thermodynamics of hot and dense quark-gluon plasma. As we are interested in a temperature regime, in which naive perturbation theory is known to lose its predictive power, we clearly need to use a refined approach. To this end, we adopt a resummed perturbation theory point of view and employ two different frameworks. We first use hard-thermal-loop perturbation theory (HLTpt) at leading order to obtain the pressure for nonvanishing quark chemical potentials, and next, inspired by dimensional reduction, resum the known four-loop weak coupling expansion for the quantity. We present and analyze our findings for various cumulants of conserved charges. This provides us with information, through correlations and fluctuations, on the degrees of freedom effectively present in the quark-gluon plasma right above the deconfinement transition. Moreover, we compare our results with state-of-the-art lattice Monte Carlo simulations as well as with a recent three-loop mass truncated HTLpt calculation. We obtain very good agreement between the two different perturbative schemes, as well as between them and lattice data, down to surprisingly low temperatures right above the phase transition. We also quantitatively test the convergence of an approximation, which is used in higher order loop calculations in HTLpt. This method based on expansions in mass parameters, is unavoidable beyond leading order, thus motivating our investigation. We find the ensuing convergence to be very fast, validating its use in higher order computations.Divergences in the quark number susceptibility: The origin and a cure
mar., 03 juin 2014 03:44:38 GMT | 1298815
BI-TP-2014-14
TIFR-TH-14-17
arXiv:1406.0474
by: Gavai, Rajiv V. (Tata Inst.) et al.
Abstract:
Quark number susceptibility on the lattice, obtained by merely adding a $\mu N$ term with $\mu$ as the chemical potential and $N$ as the conserved quark number, has a quadratic divergence in the cut-off $a$. We show that it is simply a faithful representation of the corresponding continuum result. While one can eliminate it in the free theory by suitably modifying the action, as is popularly done, it can simply be subtracted off as well. Computations of higher order susceptibilities, needed for estimating the location of the QCD critical point, then need a lot fewer number of quark propagators at any order. We show that in the interacting theory this method of divergence removal works.Measurement of the charged-pion polarizability
mar., 27 mai 2014 03:30:56 GMT | 1298026
CERN-PH-EP-2014-109
arXiv:1405.6377
Phys.Rev.Lett. 114 (2015) 062002
by: Adolph, C. (Erlangen - Nuremberg U.) et al.
Abstract:The COMPASS collaboration at CERN has investigated pion Compton scattering,
Discretization Effects in the $\epsilon$ Domain of QCD
sam., 24 mai 2014 19:34:47 GMT | 1297671
PoS LATTICE2013 (2014) 120
by: Kieburg, Mario (Bielefeld U.) et al.
Abstract:
At nonzero lattice spacing the QCD partition function with Wilson quarks undergoes either a second order phase transition to the Aoki phase for decreasing quark mass or shows a first order jump when the quark mass changes sign. We discuss these phase transitions in terms of Wilson Dirac spectra and show that the first order scenario can only occur in the presence of dynamical quarks while in the quenched case we can only have a transition to the Aoki phase. The exact microscopic spectral density of the non-Hermitian Wilson Dirac operator with dynamical quarks is discussed as well. We conclude with some remarks on discretization effects for the overlap Dirac operator.Perturbative QCD in acceptable schemes with holomorphic coupling
ven., 23 mai 2014 05:02:38 GMT | 1297504
USM-TH-324
arXiv:1405.5815
by: Contreras, Carlos (Santa Maria U., Valparaiso) et al.
Abstract:
Perturbative QCD in mass independent schemes leads in general to running coupling $a(Q^2)$ which is nonanalytic (nonholomorphic) in the regime of low spacelike momenta $|Q^2| \lesssim 1 \ {\rm GeV}^2$. Such (Landau) singularities are inconvenient in the following sense: evaluations of spacelike physical quantities ${\cal D}(Q^2)$ with such a running coupling $a(\kappa Q^2)$ ($\kappa \sim 1$) give us expressions with the same kind of singularities, while the general principles of local quantum field theory require that the mentioned physical quantities have no such singularities. In a previous work, certain classes of perturbative mass independent beta functions were found such that the resulting coupling was holomorphic. However, the resulting perturbation series showed explosive increase of coefficients already at ${\rm N}^4{\rm LO}$ order, as a consequence of the requirement that the theory reproduce the correct value of the $\tau$ lepton semihadronic strangeless decay ratio $r_{\tau}$. In this work we successfully extend the construction to specific classes of perturbative beta functions such that the perturbation series do not show explosive increase of coefficients, the perturbative coupling is holomorphic, and the correct value of $r_{\tau}$ is reproduced. In addition, we extract, with Borel sum rule analysis of the V+A channel of the semihadronic strangeless decays of $\tau$ lepton, reasonable values of the corresponding D=4 and D=6 condensates.Strangeness at high temperatures
ven., 09 mai 2014 17:18:12 GMT | 1295103
J.Phys.Conf.Ser. 509 (2014) 012098
by: Schmidt, Christian (Bielefeld U.)
Abstract:
We use up to fourth order cumulants of net strangeness fluctuations and their correlations with net baryon number fluctuations to extract information on the strange meson and baryon contribution to the low temperature hadron resonance gas, the dissolution of strange hadronic states in the crossover region of the QCD transition and the quasi-particle nature of strange quark contributions to the high temperature quark-gluon plasma phase.The Calibration of Quarkonium Production in Nuclear Collisions
mar., 06 mai 2014 14:18:15 GMT | 1294401
Acta Phys.Polon.Supp. 7 (2014) 49-58
by: Satz, Helmut (Bielefeld U.)
Abstract:
Quarkonium production has been considered as a tool to study the medium formed in high energy nuclear collisions, assuming that the forma- tion of a hot and dense environment modifies the production pattern ob- served in elementary collisions. The basic features measured there are the relative fractions of hidden to open heavy flavor and the relative fractions of the different hidden heavy flavor states. Hence the essential question is if and how these quantities are modified in nuclear collisions. We show how the relevant data must be calibrated, i.e. , what reference has to be used, in order to determine this in a model-independent way.Hadrosynthesis and Quark Confinement
mar., 06 mai 2014 13:01:30 GMT | 1294353
EPJ Web Conf. 71 (2014) 00119
by: Satz, Helmut (Bielefeld U.)
Abstract:
Multihadron production in high energy collisions, from e^+e^- annihilation to heavy ion interactions, shows remarkable thermal behaviour, specified by a universal 'Hagedorn' temperature. We argue that this hadronic radiation is formed by tunnelling through the event horizon of colour confinement, i.e., that it is the QCD counterpart of Hawking-Unruh radiation from black holes. It is shown to be emitted at a universal temperature T_H ≃ (sigma/2pi)^1/2, where sigma denotes the string tension. Since the event horizon does not allow information transfer, the radiation is thermal 'at birth'.The Quarkonium Analysis of the QGP
mar., 06 mai 2014 13:01:29 GMT | 1294352
EPJ Web Conf. 71 (2014) 00118
by: Satz, Helmut (Bielefeld U.)
Abstract:
Quarkonium production has been considered as a tool to study the medium formed in high energy nuclear collisions, assuming that the formation of a hot and dense environment modifies the production pattern observed in elementary collisions. The basic features measured there are the relative fractions of hidden to open heavy flavor and the relative fractions of the different hidden heavy flavor states. Hence the essential question is if and how these quantities are modified in nuclear collisions. We show how the relevant data must be calibrated, i.e., what reference has to be used, in order to determine this in a model-independent way.CP violation and electroweak baryogenesis in the Standard Model
ven., 25 avril 2014 12:43:27 GMT | 1292283
EPJ Web Conf. 70 (2014) 00078
by: Brauner, Tomas (Bielefeld U.)Hard-Thermal-Loop QCD thermodynamics and quark number susceptibility
ven., 25 avril 2014 12:43:08 GMT | 1292246
EPJ Web Conf. 70 (2014) 00031
by: Mogliacci, Sylvain (Bielefeld U.) et al.The shape of the radio wavefront of extensive air showers as measured with LOFAR
mer., 16 avril 2014 03:39:18 GMT | 1290506
arXiv:1404.3907
Astropart.Phys. 61 (2015) 22-31
by: Corstanje, A. (Nijmegen U., IMAPP) et al.
Abstract:
Extensive air showers, induced by high energy cosmic rays impinging on the Earth’s atmosphere, produce radio emission that is measured with the LOFAR radio telescope. As the emission comes from a finite distance of a few kilometers, the incident wavefront is non-planar. A spherical, conical or hyperbolic shape of the wavefront has been proposed, but measurements of individual air showers have been inconclusive so far. For a selected high-quality sample of 161 measured extensive air showers, we have reconstructed the wavefront by measuring pulse arrival times to sub-nanosecond precision in 200 to 350 individual antennas. For each measured air shower, we have fitted a conical, spherical, and hyperboloid shape to the arrival times. The fit quality and a likelihood analysis show that a hyperboloid is the best parameterization. Using a non-planar wavefront shape gives an improved angular resolution, when reconstructing the shower arrival direction. Furthermore, a dependence of the wavefront shape on the shower geometry can be seen. This suggests that it will be possible to use a wavefront shape analysis to get an additional handle on the atmospheric depth of the shower maximum, which is sensitive to the mass of the primary particle.The state of nonrelativistic quantum system in a relativistic reference frame
ven., 14 mars 2014 04:29:39 GMT | 1285739
arXiv:1403.3114
by: Sharph, I.V. (Odessa State Polytechnic U.) et al.
Abstract:
We consider the problem of internal particle state transformation, which is a bound state of several constituents, from the particle's rest frame to the system in which this particle is relativistic. It is assumed that in the rest frame of the composite particle, its internal state can be considered in the nonrelativistic approximation. It is shown, that this internal state is unchanged during the transition from one reference frame to another. Namely, given the particle is spherically symmetric in the rest frame, it remains spherically symmetric in any other reference frame, and does not undergo Lorentz contraction along the direction of motion of moving reference frame with respect to the rest frame. We discuss a possible application of these results to the description of hadron-hadron scattering, considering hadrons as a bound states of quarks.Thermodynamics of strong interaction matter from lattice QCD and the hadron resonance gas model
mar., 31 déc. 2013 04:20:23 GMT | 1275625
arXiv:1312.7659
Acta Phys.Polon.Supp. 7 (2014) 117-126
by: Karsch, Frithjof (Brookhaven)
Abstract:
We compare recent lattice QCD calculations of higher order cumulants of net-strangeness fluctuations with hadron resonance gas (HRG) model calculations. Up to the QCD transition temperature Tc=( 154 +/- 9) MeV we find good agreement between QCD and HRG model calculations of second and fourth order cumulants, even when subtle aspects of net-baryon number, strangeness and electric charge fluctuations are probed. In particular, the fourth order cumulants indicate that also in the strangeness sector of QCD the failure of HRG model calculations sets in quite abruptly in the vicinity of the QCD transition temperature and is apparent in most observables for T > 160 MeV.The strange degrees of freedom in QCD at high temperature
jeu., 19 déc. 2013 04:56:44 GMT | 1272687
arXiv:1312.4977
PoS LATTICE2013 (2014) 152
by: Schmidt, Christian (Bielefeld U.)
Abstract:
We discuss recent results on fluctuations of conserved charges, and their approach to the hadron resonance gas at temperatures below the chiral crossover (Tc) as well as to a gas of free quarks at very high temperatures. We will focus on the strange degrees of freedom and verify that they are consistent with those of an uncorrelated gas of hadrons for temperatures of T<160 MeV and that they can be described by a quasi particle model at best for T>2Tc. To extract this information we use all cumulants of net baryon number and net strangeness fluctuations and their correlations up to the fourth order. In particular we propose observables that serve as indicator for the validity of the hadronic degrees of freedom and show that the partial pressures from different strangeness sectors agree separately with HRG model predictions.Meson screening masses at finite temperature with Highly Improved Staggered Quarks
mar., 17 déc. 2013 06:32:33 GMT | 1269463
arXiv:1312.4375
PoS LATTICE2013 (2014) 149
by: Maezawa, Yu (Brookhaven) et al.
Abstract:
We report on the first study of the screening properties of the mesonic excitations with strange ($s$) and charm ($c$) quarks, specifically the ground states of the pseudo-scalar and vector meson excitations for the $\bar{s}s$, $\bar{s}c$ and $\bar{c}c$ flavor combinations, using the Highly Improved Staggered Quark action with dynamical physical strange quark and nearly-physical up and down quarks. By comparing with their respective vacuum meson masses and by investigating the influence of the changing temporal boundary conditions of the valence quarks we study the thermal modifications of these mesonic excitations. While the $\bar{s}s$ states show significant modifications even below the chiral crossover temperature $T_c$, the modifications of the open-charm and charmonium like states become visible only for temperatures $T\gtrsim T_c$ and $T\gtrsim1.2T_c$, respectively.Chiral phase transition of $N_f$=2+1 QCD with the HISQ action
mar., 03 déc. 2013 06:11:56 GMT | 1266965
arXiv:1312.0119
PoS LATTICE2013 (2014) 157
by: Ding, H.-T. (Brookhaven) et al.
Abstract:
We present studies of universal properties of the chiral phase transition in $N_f$=2+1 QCD based on the simulations using Highly Improved Staggered fermions on lattices with temporal extent $N_\tau$=6. We analyze the quark mass and volume dependence of the chiral condensates and chiral susceptibilities in QCD with two degenerate light quarks and a strange quark. The strange quark mass is chosen to be fixed to its physical value ($m^{phy}_s$) and five values of light quark masses ($m_l$) that are varied in the interval 1/20$\gtrsim m_l/m^{phy}_s \gtrsim$1/80. Here various quark masses correspond to pseudo Goldstone pion masses ranging from about 160 MeV to about 80 MeV. The O(N) scaling of chiral observables and the influence of universal scaling on physical observables in the region of physical quark mass values are also discussed.First order thermal phase transition with 126 GeV Higgs mass
Tue, 19 Nov 2013 04:25:38 GMT | 1264813
arXiv:1311.4424
PoS LATTICE2013 (2014) 104
by: Laine, M. (Bern U.) et al.
Abstract:
We study the strength of the electroweak phase transition in models with two light Higgs doublets and a light SU(3)_c triplet by means of lattice simulations in a dimensionally reduced effective theory. In the parameter region considered the transition on the lattice is significantly stronger than indicated by a 2-loop perturbative analysis. Within some ultraviolet uncertainties, the finding applies to MSSM with a Higgs mass m_h approximately 126 GeV and shows that the parameter region useful for electroweak baryogenesis is enlarged. In particular (even though only dedicated analyses can quantify the issue), the tension between LHC constraints after the 7 TeV and 8 TeV runs and frameworks where the electroweak phase transition is driven by light stops, seems to be relaxed.Chiral restoration and deconfinement in two-color QCD with two flavors of staggered quarks
Tue, 19 Nov 2013 04:25:31 GMT | 1264805
arXiv:1311.4324
PoS LATTICE2013 (2014) 191
by: Scheffler, David (Darmstadt, Tech. U.) et al.
Abstract:
In preparation of lattice studies of the two-color QCD phase diagram we study chiral restoration and deconfinement at finite temperature with two flavors of staggered quarks using an RHMC algorithm on GPUs. We first study unquenching effects in local Polyakov loop distributions, and the Polyakov loop potential obtained via Legendre transformation, in a fixed-scale approach for heavier quarks. We also present the chiral condensate and the corresponding susceptibility over the lattice coupling across the chiral transition for lighter quarks. Using Ferrenberg-Swendsen reweighting we extract the maxima of the chiral susceptibility in order to determine pseudo-critical couplings on various lattices suitable for chiral extrapolations. These are then used to fix the relation between coupling and temperature in the chiral limit.Charge Fluctuations as Thermometer for Heavy-Ion Collisions
Mon, 18 Nov 2013 03:34:33 GMT | 1264681
arXiv:1311.3965
PoS LATTICE2013 (2014) 159
by: Wagner, Mathias (Bielefeld U.)
Abstract:
We present a determination of freeze-out conditions in heavy-ion collisions based on ratios of cu- mulants of net electric charge fluctuations obtained from lattice QCD. These ratios can reliably be calculated for a wide range of chemical potential values by using a next-to-leading order Taylor series expansion around the limit of vanishing baryon, electric charge and strangeness chemical potentials. We first determine the strangeness and electric charge chemical potentials that characterize the conditions in heavy ion collisions at RHIC and LHC. We then show that a comparison of lattice QCD results for ratios of up to third order cumulants of electric charge fluctuations with experimental results allows us to extract the freeze-out baryon chemical potential and the freeze-out temperature. We apply our method to preliminary data of the STAR and PHENIX collaborations.Investigation of the $U_A(1)$ in high temperature QCD on the lattice
Mon, 18 Nov 2013 03:34:25 GMT | 1264679
arXiv:1311.3943
PoS LATTICE2013 (2014) 164
by: Sharma, Sayantan (Bielefeld U.) et al.
Abstract:
In this project we study the effect of the $U_A(1)$ anomaly for (2+1)-flavour QCD at high temperature. We apply the overlap operator as a tool to probe the topological properties of gauge field configurations which have been generated within the Highly Improved Staggered Quark (HISQ) discretization scheme on lattices of size $32^3\times 8$ with $m_l/m_s=1/20$, commonly used for the study of QCD thermodynamics. Although we have at present, only results for one value of the quark masses and thus cannot monitor the change of the eigenvalue distributions with the light quark mass, the distribution of the low-lying eigenvalues of the overlap operator suggests that the $U_A(1)$ is not restored effectively even at 1.5 times the pseudo critical temperature. The corresponding low-lying eigenmodes show localization properties.Towards the continuum limit in transport coefficient computations
Mon, 18 Nov 2013 03:34:14 GMT | 1264668
arXiv:1311.3759
PoS LATTICE2013 (2014) 453
by: Francis, A. (Mainz U., Inst. Kernphys.) et al.
Abstract:
The analytic continuation needed for the extraction of transport coefficients necessitates in principle a continuous function of the Euclidean time variable. We report on progress towards achieving the continuum limit for 2-point correlator measurements in thermal SU(3) gauge theory, with specific attention paid to scale setting. In particular, we improve upon the determination of the critical lattice coupling and the critical temperature of pure SU(3) gauge theory, estimating r0*Tc ~ 0.7470(7) after a continuum extrapolation. As an application the determination of the heavy quark momentum diffusion coefficient from a correlator of colour-electric fields attached to a Polyakov loop is discussed.Discretization Effects in the $\epsilon$ Domain of QCD
Fri, 15 Nov 2013 04:25:33 GMT | 1264490
arXiv:1311.3647
by: Kieburg, Mario (Bielefeld U.) et al.
Abstract:
At nonzero lattice spacing the QCD partition function with Wilson quarks undergoes either a second order phase transition to the Aoki phase for decreasing quark mass or shows a first order jump when the quark mass changes sign. We discuss these phase transitions in terms of Wilson Dirac spectra and show that the first order scenario can only occur in the presence of dynamical quarks while in the quenched case we can only have a transition to the Aoki phase. The exact microscopic spectral density of the non-Hermitian Wilson Dirac operator with dynamical quarks is discussed as well. We conclude with some remarks on discretization effects for the overlap Dirac operator.The Effect of the Low Energy Constants on the Spectral Properties of the Wilson Dirac Operator
Mon, 28 Oct 2013 09:18:25 GMT | 1262123
arXiv:1310.7009
PoS LATTICE2013 (2014) 117
by: Kieburg, Mario (Bielefeld U.) et al.
Abstract:
We summarize recent analytical results obtained for lattice artifacts of the non-Hermitian Wilson Dirac operator. Hereby we discuss the effect of all three low energy constants. In particular we study the limit of small lattice spacing and also consider the regime of large lattice spacing which is closely related to the mean field limit. Thereby we extract simple relations between measurable quantities like the average number of additional real modes and the low energy constants. These relations may improve the fitting for the low energy constants.A classification of 2-dim Lattice Theory
Mon, 28 Oct 2013 09:18:22 GMT | 1262121
arXiv:1310.6948
PoS LATTICE2013 (2014) 337
by: Kieburg, Mario (Bielefeld U.) et al.
Abstract:
A unified classification and analysis is presented of two dimensional Dirac operators of QCD-like theories in the continuum as well as in a naive lattice discretization. Thereby we consider the quenched theory in the strong coupling limit. We do not only consider the case of a lattice which has an even number of lattice sites in both directions and is thus equivalent to the case of staggered fermions. We also study lattices with one or both directions with an odd parity to understand the general mechanism of changing the universality class via a discretization. Furthermore we identify the corresponding random matrix ensembles sharing the global symmetries of these QCD-like theories. Despite the Mermin-Wagner-Coleman theorem we find good agreement of lattice data with our random matrix predictions.Quark-gluon plasma phenomenology from the lattice
Mon, 21 Oct 2013 02:28:07 GMT | 1261280
arXiv:1310.5135
J.Phys.Conf.Ser. 509 (2014) 012015
by: Allton, Chris (Swansea U.) et al.
Abstract:
The FASTSUM Collaboration has calculated several quantities relevant for QCD studies at non-zero temperature using the lattice technique. We report here our results for the (i) interquark potential in charmonium; (ii) bottomonium spectral functions; and (iii) electrical conductivity. All results were obtained with 2+1 flavours of dynamical fermions on an anisotropic lattice which allows greater resolution in the temporal direction.Mass-radius constraints for compact stars and a critical endpoint
Tue, 15 Oct 2013 03:13:29 GMT | 1258374
arXiv:1310.3803
PoS CPOD2013 (2013) 063
by: Blaschke, David (Wroclaw U.) et al.
Abstract:
We present two types of models for hybrid compact stars composed of a quark core and a hadronic mantle with an abrupt first order phase transition at the interface which are in accordance with the latest astrophysical measurements of two 2 M_sun pulsars. While the first is a schematic one, the second one is based on a QCD motivated nonlocal PNJL model with density-dependent vector coupling strength. Both models support the possibility of so called twin compact stars which have the same mass but different radius and internal structure at high mass (~2 M_sun), provided they exhibit a large jump \Delta \epsilon in the energy density of the first order phase transition fulfilling \Delta \epsilon/\epsilon_crit > 0.6. We conclude that the measurement of high-mass twin stars would support the existence of a first order phase transition in symmetric matter at zero temperature entailing the existence of a critical end point in the QCD phase diagram.Strangeness at high temperatures
Mon, 14 Oct 2013 02:36:41 GMT | 1258138
arXiv:1310.3175
by: Schmidt, Christian (Bielefeld U.)
Abstract:
We use up to fourth order cumulants of net strangeness fluctuations and their correlations with net baryon number fluctuations to extract information on the strange meson and baryon contribution to the low temperature hadron resonance gas, the dissolution of strange hadronic states in the crossover region of the QCD transition and the quasi-particle nature of strange quark contributions to the high temperature quark-gluon plasma phase.A robust public catalogue of voids and superclusters in the SDSS Data Release 7 galaxy surveys
Fri, 11 Oct 2013 14:03:19 GMT | 1258063
arXiv:1310.2791
Mon.Not.Roy.Astron.Soc. 440 (2014) 1248-1262
by: Nadathur, Seshadri (Bielefeld U.) et al.
Abstract:
The study of the interesting cosmological properties of voids in the Universe depends on the efficient and robust identification of such voids in galaxy redshift surveys. Recently, Sutter et al. (2012) have published a public catalogue of voids in the Sloan Digital Sky Survey Data Release 7 main galaxy and luminous red galaxy samples, using the void-finding algorithm ZOBOV, which is based on the watershed transform. We examine the properties of this catalogue and show that it suffers from several problems and inconsistencies, including the identification of some extremely overdense regions as voids. As a result, cosmological results obtained using this catalogue need to be reconsidered. We provide instead an alternative, self-consistent, public catalogue of voids in the same galaxy data, obtained from using an improved version of the same watershed transform algorithm. We provide a more robust method of dealing with survey boundaries and masks, as well as with a radially varying selection function, which means that our method can be applied to any other survey. We discuss some basic properties of the voids thus discovered, and describe how further information may be obtained from the catalogue. In addition, we apply an inversion of the algorithm to the same data to obtain a corresponding catalogue of large-scale overdense structures, or "superclusters". Our catalogues are available for public download at www.hip.fi/nadathur/download/dr7catalogue.Quark number susceptibilities at high temperatures
Wed, 11 Sep 2013 03:45:15 GMT | 1253558
BNL-102058-2013-JA
arXiv:1309.2317
Phys.Rev. D88 (2013) 094021
by: Bazavov, A. (Brookhaven) et al.
Abstract:
We calculate second and fourth order quark number susceptibilities for 2+1 flavor QCD in the high temperature region. In our study, we use two improved staggered fermion formulations, namely, the highly improved staggered quark formulation and the so-called p4 formulation, as well as several lattice spacings. Second order quark number susceptibilities are calculated using both improved staggered fermion formulations, and we show that in the continuum limit the two formulations give consistent results. The fourth order quark number susceptibilities are studied only using the p4 formulation and at nonzero lattice spacings. We compare our results on quark number susceptibilities with recent weak coupling calculations and find that these agree reasonably well with the lattice calculations within the estimated uncertainties.Deconfinement of strangeness and freeze-out from charge fluctuations
Thu, 25 Jul 2013 03:43:18 GMT | 1244319
arXiv:1307.6255
PoS CPOD2013 (2013) 039
by: Mukherjee, Swagato (Brookhaven) et al.
Abstract:
We use Lattice QCD calculations of fluctuations and correlations of various conserved charges to show that the deconfinement of strangeness takes place in the chiral crossover region of QCD; however, inside the quark-gluon plasma strange quarks remain strongly interacting at least up to temperatures twice the QCD crossover temperature. Further, we discuss how the freeze-out parameters of heavy-ion collisions can be determined in a model-independent way through direct comparisons between experimentally measured higher order cumulants of conserved charges and corresponding Lattice QCD calculations. Utilizing the preliminary data from the STAR and PHENIX experiments we illustrate this method. Although, the Lattice QCD based determinations of the freeze-out parameters utilizing data sets of different experiments and different observables are currently not consistent with each other, it is tantalizing to see that all the observed freeze-out parameters lie very close to the chiral/deconfinement crossover region of QCD.Transformation of the nonrelativistic quantum system under transition from one inertial reference frame to another
Wed, 10 Jul 2013 15:24:02 GMT | 1242017
arXiv:1307.2280
by: Deliyergiyev, M.A. (Stefan Inst., Ljubljana) et al.
Abstract:
We consider the problem of internal particle state transformation, which is a bound state of several particles, from the rest frame of a composite particle to the system in which it is relativistic. It is assumed that in the rest frame of the composite particle, its internal state could be considered in the nonrelativistic approximation. It has been shown, that this internal state is unchanged during the transition from one reference frame to another. Namely, the spherically symmetric particle in the rest frame stays spherically symmetric in any other reference frame. We discuss the possible application of these results for description of the hadrons scattering processes like bound states of quarks.Viscous Cold Dark Matter in agreement with observations
Tue, 25 Jun 2013 05:17:47 GMT | 1239567
arXiv:1306.5274
Int.J.Geom.Meth.Mod.Phys. 11 (2014) 1460013
by: Velten, Hermano (Espirito Santo U.)
Abstract:
We discuss bulk viscous cosmological models. Since the bulk viscous pressure is negative, viable viscous cosmological scenarios with late time accelerated expansion can in principle be constructed. After discussing some alternative models based on bulk viscous effects we will focus on a model very similar to the standard $\Lambda$CDM. We argue that a $\Lambda${\rm v}CDM model, where we assign a very small (albeit perceptible) bulk viscosity to dark matter is in agreement with available cosmological observations. Hence, we work with the concept of viscous Cold Dark Matter ({\rm v}CDM). At the level of the perturbations, the growth of {\rm v}CDM structures is slightly suppressed when compared with the standard CDM ones. Having in mind that the small scale problems of the $\Lambda$CDM model are related to an excess of clustering, our proposal seems to indicate a possible direction for solving the serious drawbacks of the CDM paradigm within the standard cosmological model.Quark number susceptibilities at intermediate coupling
Fri, 14 Jun 2013 08:21:50 GMT | 1238459
PoS ConfinementX (2012) 189
by: Su, Nan (Bielefeld U.)Finite temperature Mott transition in a nonlocal PNJL model
Tue, 11 Jun 2013 06:06:57 GMT | 1237931
arXiv:1306.1932
Acta Phys.Polon.Supp. 6 (2013) 947-952
by: Benić, Sanjin (Zagreb U.) et al.
Abstract:
We provide a novel calculation of the Mott effect in non-local PNJL models. We find that the "deconfinement" transition temperature in these models is lower than the Mott temperature. Furthermore, the mass and the width of the $\sigma$ and the $\pi$ meson modes is calculated with the result that the width in nonlocal models is in general reduced as compared to local models. Difficulties encountered while attempting to "Wick rotate" covariant models are carefully discussed.Medium induced Lorentz symmetry breaking effects in nonlocal Polyakov–Nambu–Jona-Lasinio models
Wed, 05 Jun 2013 04:44:31 GMT | 1236824
arXiv:1306.0588
Phys.Rev. D89 (2014) 016007
by: Benic, S. (Zagreb U.) et al.
Abstract:
In this paper we detail the thermodynamics of two flavor nonlocal Polyakov-Nambu-Jona-Lasinio models for different parametrizations of the quark interaction regulators. The structure of the model is upgraded in order to allow for terms in the quark selfenergy which violate Lorentz invariance due to the presence of the medium. We examine the critical properties, the phase diagram as well as the equation of state. Furthermore, some aspects of the Mott effect for pions and sigma mesons are discussed explicitly within a nonlocal Polyakov-Nambu-Jona-Lasinio model. In particular, we continued the meson polarization function in the complex energy plane and under certain approximations, we were able to extract the imaginary part as a function of the meson energy. We were not able to calculate the dynamical meson mass, and therefore resorted to a technical study of the temperature dependence of the meson width by replacing the meson energy with the temperature dependent spatial meson mass. Our results show that while the temperature behavior of the meson widths is qualitatively the same for a wide class of covariant regulators, the special case where the nonlocal interactions are introduced via the instanton liquid model singles out with a drastically different behavior.Generalized Beth--Uhlenbeck approach to mesons and diquarks in hot, dense quark matter
Fri, 17 May 2013 04:17:25 GMT | 1233725
arXiv:1305.3907
Annals Phys. 348 (2014) 228-255
by: Blaschke, D. (Wroclaw U.) et al.
Abstract:
An important first step in the program of hadronization of chiral quark models is the bosonization in meson and diquark channels. This procedure is presented at finite temperatures and chemical potentials for the SU(2) flavor case of the NJL model with special emphasis on the mixing between scalar meson and scalar diquark modes which occurs in the 2SC color superconducting phase. The thermodynamic potential is obtained in the gaussian approximation for the meson and diquark fields and it is given the Beth-Uhlenbeck form. This allows a detailed discussion of bound state dissociation in hot, dense matter (Mott effect) in terms of the in-medium scattering phase shift of two-particle correlations. It is shown for the case without meson-diquark mixing that the phase shift can be separated into a continuum and a resonance part. In the latter, the Mott transition manifests itself by a change of the phase shift at threshold by \pi\ in accordance with Levinson's theorem, when a bound state transforms to a resonance in the scattering continuum. The consequences for the contribution of pionic correlations to the pressure are discussed by evaluating the Beth-Uhlenbeck equation of state in different approximations. A similar discussion is performed for the scalar diquark channel in the normal phase. Further developments and applications of the developed approach are outlined.Making the most of Taylor expansion and imaginary $\mu$
Fri, 12 Apr 2013 04:07:31 GMT | 1227939
arXiv:1304.3247
J.Phys.Conf.Ser. 432 (2013) 012016
by: Laermann, E. (Bielefeld U.) et al.
Abstract:
We present preliminary results for the curvature of the pseudocritical line and susceptibilities in Nf = 2 + 1 flavor QCD. The computations are carried out on lattice sizes of 16x16x16x4, at matching parameters of early work of the Bielefeld group. Emphasis is placed on the control of systematic errors, by cross-validating results obtained by use of the Taylor expansion and measurements at imaginary chemical potential. To this end, we generalize the magnetic equation of state to the analysis of the number density, and we extend it to imaginary values of the chemical potential.Dirac operators in gauge theory
Wed, 13 Mar 2013 11:20:27 GMT | 1223552
arXiv:1303.2971
by: Haydys, Andriy (Bielefeld U.)
Abstract:
This paper is a mixture of expository material and current research material. Among new results are examples of generalised harmonic spinors and their gauged version, the generalised Seiberg-Witten equations.The Color Dipole Picture
Sat, 05 Jan 2013 23:00:00 GMT | 1209438
arXiv:1301.0714
AIP Conf.Proc. 1523 (2012) 329-334
by: Schildknecht, Dieter (Bielefeld U.)
Abstract:
We give a brief exposition of the color dipole picture of deep inelastic scattering.Universal properties of moments of net baryon number fluctuations
Tue, 06 Nov 2012 23:00:00 GMT | 1202099
Acta Phys.Polon.Supp. 5 (2012) 747-755
by: Karsch, Frithjof (Brookhaven)Lattice versus 2PI: 2d O(N) model at nonzero T
Tue, 16 Oct 2012 22:00:00 GMT | 1191025
arXiv:1210.4744
Acta Phys.Polon.Supp. 5 (2012) 1045-1050
by: Seel, Elina (Frankfurt U.) et al.
Abstract:
The thermodynamics of the O(N) model in 1+1 dimensions is studied applying the CJT formalism and the auxiliary field method as well as fully nonperturbative finite temperature lattice simulations. The numerical results for the renormalized mass of the scalar particles, the pressure and the trace anomaly are presented and compared with the results from lattice simulation of the model. We find that when going to the two loop order we observe a good correspondence between the CJT formalism and the lattice study.Gluon Loops in the Inelastic Processes in QCD
Sat, 13 Oct 2012 22:00:00 GMT | 1190531
arXiv:1210.3490
by: Sharf, I.V. (Odessa State Polytechnic U.) et al.
Abstract:
It is shown that inelastic process of the exchange with two massless gluons is formally equivalent to the process of the exchange with one massive particle. Thus, using the Laplace's method, a new mechanism of mass generation in inelastic processes is discovered, which is described by the non-Abelian gauge theory. Furthermore, it is shown that in the QCD perturbation theory, the same mechanisms of cross-sections growth take place, similar to the ones discovered before in the effective scalar theories.Top quark pairs at two loops and Reduze 2
Wed, 03 Oct 2012 22:00:00 GMT | 1189450
arXiv:1210.1436
PoS LL2012 (2012) 059
by: von Manteuffel, Andreas (Bielefeld U.) et al.
Abstract:
We report on progress for the analytical calculation of the two-loop corrections to top quark pair production at hadron colliders. For the light fermionic corrections in the gluon channel, we discuss the analytical solution for the master integrals of a non-planar double box with a massive propagator. The result in terms of Goncharov's multiple polylogarithms is handled using systematic reductions based on the symbol map and the coproduct. We discuss new features of the computer program Reduze 2. It provides a fully distributed variant of Laporta's algorithm to reduce loop integrals. New graph matroid based algorithms allow to calculate shift relations between Feynman integrals in a fully automated way.Color Transparency and Saturation in QCD
Mon, 01 Oct 2012 22:00:00 GMT | 1189011
arXiv:1210.0733
by: Schildknecht, Dieter (Bielefeld U.)
Abstract:
We review the theoretical interpretation of deep-inelastic electron-proton scattering at low values of the Bjorken variable $x \simeq Q^2/W^2 \lsim 0.1$. The process proceeds via the interaction of quark-antiquark $(q \bar q)$ color-dipole fluctuations of the (virtual) photon with the proton. In terms of the forward Compton scattering amplitude, two reaction channels contribute to the interaction of the $q \bar q$ color dipole with the gluon field in the proton. Dependent on the kinematics, there is either {\it color transparency}, corresponding to a cancellation of the amplitudes for the two reaction channels, or {\it saturation}, occuring when the process is dominated by a single interaction channel. The connection between the color-dipole picture and the pQCD improved parton model is elaborated upon.Charmonium dissociation and heavy quark transport in hot quenched lattice QCD
Sun, 30 Sep 2012 22:00:00 GMT | 1188836
arXiv:1210.0292
EPJ Web Conf. 70 (2014) 00061
by: Ding, H.-T. (Brookhaven) et al.
Abstract:
We study the properties of charmonium states at finite temperature in quenched lattice QCD on large and fine isotropic lattices. We perform a detailed analysis of charmonium correlation and spectral functions both below and above Tc. Our analysis suggests that the S wave states disappear at about 1.5 Tc. The charm diffusion coefficient is estimated and found to be approximately 1/{\pi}T at 1.5Tc {\leq} T {\leq} 3Tc.Thermodynamics of the O(3) model in 1+1 dimensions: lattice vs. analytical results
Tue, 18 Sep 2012 22:00:00 GMT | 1186560
arXiv:1209.4243
JHEP 1307 (2013) 010
by: Seel, Elina (Bielefeld U.) et al.
Abstract:
A detailed study of the thermodynamics of the O(N = 3) model in 1+1 dimensions is presented, employing a two-particle-irreducible resummation prescription as well as fully nonperturbative finite-temperature lattice simulations. The analytical results are computed using the Cornwall-Jackiw-Tomboulis (CJT) formalism and the auxiliary field method to one- and to two-loop order. The lattice results are obtained through Monte Carlo simulation for various lattice spacings. The analytical and lattice results for pressure, trace anomaly, and energy density, resembling closely those of four-dimensional Yang-Mills theories, are compared with each other. We find that to one-loop order there is a good correspondence between the CJT formalism and the lattice study for low temperatures. However, at high T the two-loop calculation fares better, correcting for the overestimation from the former approximation.Center-symmetric effective theory for two-color QCD with massive quarks at nonzero chemical potential
mar., 21 août 2012 22:00:00 GMT | 1180105
PoS EPS-HEP2011 (2011) 315
by: Brauner, Tomas (Bielefeld U.)PJFry: A C++ package for tensor reduction of one-loop Feynman intergals
lun., 26 mars 2012 22:00:00 GMT | 1094929
DESY-11-252
BI-TP-2011-51
by: Fleischer, J. (Bielefeld U.) et al.Testing possible gluon number fluctuations in HERA data
mar., 30 août 2011 22:00:00 GMT | 925832
Indian J.Phys. 85 (2011) 1207-1213
by: Xiang, W. (Bielefeld U.)
Abstract:
The gluon number fluctuations in diffractive deep inelastic scattering (DIS) at low values of the Bjorken variable x is considered in the IIM model with fixed coupling case. We find that the IIM model with gluon number fluctuations can be better de scription for the diffractive DIS data than IIM model without fluctuations.News on hadrons in a hot medium
lun., 29 août 2011 22:00:00 GMT | 925743
arXiv:1108.5965
BI-TP-2011-19
by: Laine, M. (Bielefeld U.)
Abstract:
Some of the modifications that a thermal medium, of the type generated in heavy ion collision experiments at the LHC, may impose on the properties of hadrons, are reviewed. The focus is on hadrons containing at least one heavy quark (charm or bottom or their antiparticles).Quantization in classical mechanics and its relation to the Bohmian Psi-field
jeu., 30 juin 2011 22:00:00 GMT | 916457
arXiv:0906.1723
Annals Phys. 326 (2011) 1807-1815
by: Rusov, V.D. (Odessa State Polytechnic U.) et al.
Abstract:
Based on the Chetaev theorem on stable dynamical trajectories in the presence of dissipative forces, we obtain the generalized condition for stability of Hamilton systems in the form of the Schrodinger equation. It is shown that the energy of diss ipative forces, which generate the Chetaev generalized condition of stability, coincides exactly with the Bohm ''quantum'' potential. Within the frame-work of Bohmian quantum mechanics supplemented by the generalized Chetaev theorem and on the basis of th e principle of least action for dissipative forces, we show that the squared amplitude of a wave function in the Schrodinger equation is equivalent semantically and syntactically to the probability density function for the number of particle trajectories, relative to which the velocity and the position of the particle are not hidden parameters. The conditions for the correctness of trajectory interpretation of quantum mechanics are discussed.Dynamical Evolution of Heavy Quarkonia in a Deconfined Medium
lun., 14 mars 2011 23:00:00 GMT | 892702
arXiv:1103.2945
BI-TP-2011-08
by: Borghini, Nicolas (Bielefeld U.) et al.
Abstract:
We investigate some consequences of the possibility that heavy quarkonia in a quark-gluon plasma possess different (quasi-) bound states, between which transitions are possible. In particular, we show that the time-evolution eigenstates in the medium are mixtures of the vacuum eigenstates. This leads to abundance ratios of quarkonia that differ from those predicted in statistical models or in the sequential-melting picture.Gluon number fluctuations and diffusive scaling effect
jeu., 03 mars 2011 23:00:00 GMT | 891461
Front.Phys.China 6 (2011) 100-105
by: Fischer, Wolfgang (Bielefeld U.)
Abstract:
The diffusive scaling is studied based on pomeron loop equations in the fixed coupling case. At Y ≫ Y$_{DS}$, the gluon number fluctuations become important, the geometric scaling is replaced by the diffusive scaling. In the diffusive scaling regime, the deep inelastic scattering (DIS) total scattering cross-section is a function of single variable ln $ [1/(r^2 Q_s^2 (x))]/\sqrt {DY} $ . We show that the deep inelastic scattering experimental data lie on a single curve, which seems to indicate the existence of the diffusive scaling phenomenology in the deep inelastic scattering.Gauge theory, calibrated geometry and harmonic spinors
sam., 15 janv. 2011 23:00:00 GMT | 884390
arXiv:0902.3738
J.Lond.Math.Soc. 86 (2012) 482-498
by: Haydys, Andriy (Bielefeld U.)
Abstract:
In this paper connections between different gauge-theoretical problems in high and low dimensions are established. In particular it is shown that higher dimensional asd equations on total spaces of spinor bundles over low dimensional manifolds can be interpreted as Taubes-Pidstrygach's generalization of the Seiberg-Witten equations. By collapsing each fibre of the spinor bundle to a point, solutions of the Taubes-Pidstrygach equations are related to generalized harmonic spinors. This approach is also generalized for arbitrary fibrations (without singular fibres) compatible with an appropriate calibration.
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Search Results: 243
2013 — conference paper
The Deconfinement of Charm and Beauty
Satz H (2013)
In: Journal of Physics: Conference Series. 455 IOP Science: 012045.PUB: 2616636 | INSPIRE: 1247574
2014 — article
The supersymmetry method for chiral random matrix theory with arbitrary rotation-invariant weights
Kaymak V, Kieburg M, Guhr T (2014)
Journal of Physics A Mathematical and Theoretical 47(29).PUB: 2690750 | INSPIRE: 1281732
2014 — article
QCD Phase Transition with Chiral Quarks and Physical Quark Masses
Bhattacharya T, Buchoff MI, Christ NH, Ding H-T, Gupta R, Jung C, Karsch F, Lin Z, Mawhinney RD, McGlynn G, Mukherjee S, et al. (2014)
Physical Review Letters 113(8).PUB: 2699745 | INSPIRE: 1282138
2013 — article
Properties of the electron-positron plasma created from a vacuum in a strong laser field: Quasiparticle excitations
Blaschke D, Kämpfer B, Schmidt SM, Panferov AD, Prozorkevich AV, Smolyansky SA (2013)
Physical Review D 88(4).PUB: 2616698 | INSPIRE: 1209733
2014 — article
Spin alignment and violation of the OZI rule in exclusive ω and ϕ production in pp collisions
Adolph C, Akhunzyanov R, Alexeev MG, Alexeev GD, Amoroso A, Andrieux V, Anosov V, Austregesilo A, Badełek B, Balestra F, Barth J, et al. (2014)
Nuclear Physics B 886: 1078–1101.PUB: 2687911 | INSPIRE: 1298025
2011 — article
Has $T_c$ been measured by heavy ion experiments?
Karsch F, Redlich K (2011)
Physical Review D 84(5).PUB: 2394390 | INSPIRE: 917392
2012 — article
First Measurement of Chiral Dynamics in pi(-)gamma -> pi(-)pi(-)pi(+)
Adolph C, Alekseev MG, Alexakhin VY, Alexandrov Y, Alexeev GD, Amoroso A, Antonov AA, Austregesilo A, Badelek B, Balestra F, Barth J, et al. (2012)
Physical Review Letters 108(19): 192001.PUB: 2501414 | INSPIRE: 955170
2012 — article
Experimental investigation of transverse spin asymmetries in muon-p SIDIS processes: Collins asymmetries
Adolph C, Alekseev MG, Alexakhin VY, Alexandrov Y, Alexeev GD, Amoroso A, Antonov AA, Austregesilo A, Badelek B, Balestra F, Barth J, et al. (2012)
Phys.Lett. B 717(4-5): 376–382.PUB: 2539650 | INSPIRE: 1115720
2012 — article
Comment on “The new measurement from HERA and the dipole model”
Schildknecht D (2012)
Physics Letters B 716(3-5): 413–416.PUB: 2540094 | INSPIRE: 1112284
2013 — article
Energy momentum tensor correlators in hot Yang-Mills theory: holography confronts lattice and perturbation theory
Kajantie K, Krssak M, Vuorinen A (2013)
Journal of High Energy Physics 2013(5).PUB: 2616674 | INSPIRE: 1217882
2013 — article
Ultrahigh-energy neutrino scattering
Kuroda M, Schildknecht D (2013)
Physical Review D 88(5).PUB: 2635934 | INSPIRE: 1231749
2013 — article
Polyakov loop fluctuations in SU(3) lattice gauge theory and an effective gluon potential
Lo PM, Friman B, Kaczmarek O, Redlich K, Sasaki C (2013)
Physical Review D 88(7).PUB: 2638527 | INSPIRE: 1244133
2015 — article
Odd and even partial waves of eta pi(-) and eta 'pi(-) in pi(-) p -> eta(('))pi(-)p at 191 GeV/c
Adolph C, Akhunzyanov R, Alexeev MG, Alexeev GD, Amoroso A, Andrieux V, Anosov V, Austregesilo A, Badelek B, Balestra F, Barth J, et al. (2015)
Physics Letters B 740: 303–311.PUB: 2720090 | INSPIRE: 1311486
2012 — preprint
The SM and NLO Multileg and SM MC Working Groups: Summary Report
Maestre JA, Alioli S, Andersen JR, Ball RD, Buckley A, Cacciari M, Campanario F, Chanon N, Chachamis G, Ciulli V, Cossutti F, et al. (2012)
arXiv:1203.6803 .PUB: 2540099 | INSPIRE: 1095506
2013 — preprint
Three-loop HTLpt Pressure and Susceptibilities at Finite Temperature and Density
Haque N, Andersen JO, Mustafa MG, Strickland M, Su N (2013)
arXiv:1309.3968 .PUB: 2642693 | INSPIRE: 1254232
2012 — conference paper
The phase structure of strongly interacting matter
Satz H (2012)
In: Acta Physica Polonica B. 43: 587–598.PUB: 2510041 | INSPIRE: 1180272
2012 — conference paper
The color dipole picture of low-x DIS
Schildknecht D (2012)
In: Nuclear Physics B - Proceedings Supplements. 222-224: 108–118.PUB: 2540517 | INSPIRE: 1081164
2014 — article
An efficient method to compute the residual phase on a Lefschetz thimble
Cristoforetti M, Di Renzo F, Eruzzi G, Mukherjee A, Schmidt C, Scorzato L, Torrero C (2014)
Physical Review D 89(11).PUB: 2690848 | INSPIRE: 1286902
2014 — article
Three-loop HTLpt thermodynamics at finite temperature and chemical potential
Haque N, Bandyopadhyay A, Andersen JO, Mustafa MG, Strickland M, Su N (2014)
Journal of High Energy Physics (5): 027.PUB: 2670701 | INSPIRE: 1282909
2012 — article
Holographic dilepton production in a thermalizing plasma
Baier R, Stricker SA, Taanila O, Vuorinen A (2012)
Journal of High Energy Physics 2012(7).PUB: 2518780 | INSPIRE: 1114509
2012 — article
Charmonium production and corona effect
Digal S, Satz H, Vogt R (2012)
Physical Review C 85(3).PUB: 2489195 | INSPIRE: 946849
2012 — article
Two-color QCD via dimensional reduction
Zhang T, Brauner T, Kurkela A, Vuorinen A (2012)
Journal of High Energy Physics 2012(2).PUB: 2455019 | INSPIRE: 1081117
2012 — article
DARKON FLUID — A MODEL FOR THE DARK SECTOR OF THE UNIVERSE?
STICHEL PC, ZAKRZEWSKI WOJTEKJ (2012)
International Journal of Geometric Methods in Modern Physics 09(06): 1261014.PUB: 2540271 | INSPIRE: 1090079
2013 — article
Calibrating the In-Medium Behavior of Quarkonia
Satz H (2013)
Advances in High Energy Physics 2013: 1–6.PUB: 2606319 | INSPIRE: 1223872
2013 — article
Study of Σ(1385) and Ξ(1321) hyperon and antihyperon production in deep inelastic muon scattering
Adolph C, Alekseev M, Alexakhin VY, Alexandrov Y, Alexeev GD, Amoroso A, Austregesilo A, Badelek B, Balestra F, Barth J, Baum G, et al. (2013)
European Physical Journal C 73(10).PUB: 2605905 | INSPIRE: 1226812
2013 — article
Equation of State of hot and dense QCD: Resummed perturbation theory confronts lattice data
Mogliacci S, Andersen JO, Strickland M, Su N, Vuorinen A (2013)
Journal of High Energy Physics 2013(12): 055.PUB: 2616647 | INSPIRE: 1245256
2014 — article
Transverse target spin asymmetries in exclusive $ρ^0$ muoproduction
Adolph C, Alekseev MG, Alexakhin VY, Alexandrov Y, Alexeev GD, Amoroso A, Andrieux V, Austregesilo A, Badellek B, Balestra F, Barth J, et al. (2014)
Physics Letters B 731: 19–26.PUB: 2642248 | INSPIRE: 1257385
2013 — article
A renormalization group approach for QCD in a strong magnetic field
Kojo T, Su N (2013)
Physics Letters B 726(4-5): 839–845.PUB: 2653719 | INSPIRE: 1234240
2015 — article
General relativistic, nonstandard model for the dark sector of the Universe
Stichel P, Zakrzewski WJ (2015)
The European Physical Journal C 75(1): 9.PUB: 2717488 | INSPIRE: 1315094
2013 — thesis
On the perturbative evaluation of thermal Green’s functions in the bulk and shear channels of Yang-Mills Theory
Zhu Y (2013)
Bielefeld: Universitätsbibliothek.PUB: 2611370 | INSPIRE: 1244542
2013 — thesis
Energy momentum tensor correlators in Improved Holographic QCD
Krssak M (2013)
Bielefeld: Bielefeld University.PUB: 2616452 | INSPIRE: 1256352
2012 — conference paper
U_A(1) breaking at finite temperature from the Dirac spectrum with the dynamical HISQ action
Ohno H, Heller UM, Karsch F, Mukherjee S (2012)
In: PoS Lattice (2012)095. Leineweber D, Kamleh W, Mahbub S, Matevosyan H, Thomas A, Williams A, Young R, Zanotti J (Eds);PUB: 2643233 | INSPIRE: 1202290
2013 — article
Strangeness at High Temperatures: From Hadrons to Quarks
Bazavov A, Ding H, Hegde P, Kaczmarek O, Karsch F, Laermann E, Maezawa Y, Mukherjee S, Ohno H, Petreczky P, Schmidt C, et al. (2013)
Physical Review Letters 111(8).PUB: 2625774 | INSPIRE: 1230817
2014 — article
Complex saddle points in QCD at finite temperature and density
Nishimura H, Ogilvie MC, Pangeni K (2014)
Physical Review D 90(4).PUB: 2697379 | INSPIRE: 1279607
2012 — article
On the role of longitudinal momenta in high energy hadron-hadron scattering
Sharf I, Tykhonov A, Sokhrannyi G, Deliyergiyev M, Podolyan N, Rusov V (2012)
Central European Journal of Physics 10(4): 858–887.PUB: 2523682 | INSPIRE: 941561
2012 — article
A Brief Overview of Hard-Thermal-Loop Perturbation Theory
Su N (2012)
Communications in Theoretical Physics 57(3): 409–421.PUB: 2493210 | INSPIRE: 1097062
2012 — article
Net charge probability distributions in heavy ion collisions at chemical freeze-out
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Extreme States of Matter in Strong Interaction Physics
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New results for algebraic tensor reduction of Feynman integrals
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European Physical Journal C 71(7).PUB: 2320838 | INSPIRE: 893163
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Beauty is Distractive: Particle production during multifield inflation
Battefeld D, Battefeld T, Byrnes C, Langlois D (2011)
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The k-th smallest Dirac operator eigenvalue and the pion decay constant
Akemann G, Ipsen AC (2012)
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Chiral and deconfinement aspects of the QCD transition
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Fleischer J, Riemann T, Yundin V (2012)
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2014 — conference paper
Temperature dependence of electrical conductivity and dilepton rates from hot quenched lattice QCD
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QCD Thermodynamics on the Lattice
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Strongly scale-dependent polyspectra from curvaton self-interactions
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INDIAN JOURNAL OF PHYSICS 85(1): 129–134.PUB: 2290085 | INSPIRE: 900465
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Color transparency and saturation in QCD
Schildknecht D (2014)
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Comment on "The new F-L measurement from HERA and the dipole model"
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Bulk properties of strongly interacting matter
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Strong-coupling effective action(s) for SU(3) Yang-Mills
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Miller D, Tawfik A (2012)
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Constraints on dissipative unified dark matter
Velten H, Schwarz D (2011)
Journal of Cosmology and Astroparticle Physics 2011(09): 016.PUB: 2307740 | INSPIRE: 917264
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Calculating contracted tensor Feynman integrals
Fleischer J, Riemann T (2011)
Physics Letters B 701(5): 646–653.PUB: 2326675 | INSPIRE: 896808
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Applying generalized Padé approximants in analytic QCD models
Cvetic G, Kögerler R (2011)
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Net-proton probability distribution in heavy ion collisions
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Complex Heavy-Quark Potential at Finite Temperature from Lattice QCD
Rothkopf A, Hatsuda T, Sasaki S (2012)
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Does parton saturation at high density explain hadron multiplicities at LHC?
Baier R, Mueller AH, Schiff D, Son DT (2011)
arXiv:1103.1259 .PUB: 2084088 | INSPIRE: 891570
2011 — preprint
Bias in low-multipole CMB reconstructions
Copi CJ, Huterer D, Schwarz D, Starkman GD (2011)
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Moments of charge fluctuations, pseudo-critical temperatures and freeze-out in heavy ion collisions
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Phase boundary for the chiral transition in (2+1)-flavor QCD at small values of the chemical potential
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Predictions for $p+Pb$ Collisions at $\sqrt s_NN = 5 TeV$
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Random Matrix Theory for the Hermitian Wilson Dirac Operator and the chGUE-GUE Transition
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JHEP 2011(10): 60.PUB: 2316598 | INSPIRE: 923973
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The QCD trace anomaly
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Electrical conductivity and thermal dilepton rate from quenched lattice QCD
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Heavy quarkonia in a medium as a quantum dissipative system: master-equation approach
Borghini N, Gombeaud C (2012)
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QCD trace anomaly
Andersen JO, Leganger LE, Strickland M, Su N (2011)
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The QCD Equation of State - From Nuclear Physics to Perturbation Theory
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The ultraviolet limit and sum rule for the shear correlator in hot Yang-Mills theory
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Trace anomaly and quasi-particles in finite temperature SU(N) gauge theory
Castorina P, Miller D, Satz H (2011)
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Hairy black holes in massive gravity: Thermodynamics and phase structure
Capela F, Nardini G (2012)
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QUARK MATTER AND NUCLEAR COLLISIONS: A BRIEF HISTORY OF STRONG INTERACTION THERMODYNAMICS
Satz H (2012)
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Heavy quark diffusion from lattice QCD spectral functions
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Burnier Y, Laine M, Mether L (2011)
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Charmonium correlators and spectral functions at finite temperature
Ding H-T, Kaczmarek O, Karsch F, Satz H, Soldner W (2010)
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Heavy flavour kinetic equilibration in the confined phase
Laine M (2011)
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The Quark-Gluon Plasma - A Short Introduction
Satz H (2011)
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Bär O, Golterman M (2013)
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The shear channel spectral function in hot Yang-Mills theory
Zhu Y, Vuorinen A (2013)
JHEP 2013(3): 002.PUB: 2549438 | INSPIRE: 1207599
2013 — article
Sommerfeld effect in heavy quark chemical equilibration
Bödeker D, Laine M (2013)
Journal of High Energy Physics 2013(1).PUB: 2550985 | INSPIRE: 1192938
2013 — article
Quark number susceptibilities from resummed perturbation theory
Andersen JO, Mogliacci S, Su N, Vuorinen A (2013)
Physical Review D 87(7).PUB: 2584592 | INSPIRE: 1189189
2012 — article
Towards flavour diffusion coefficient and electrical conductivity without ultraviolet contamination
Burnier Y, Laine M (2012)
The European Physical Journal C 72(2): 1902.PUB: 2459035 | INSPIRE: 1084064
2013 — article
Lattice study of an electroweak phase transition atmh≃ 126 GeV
Laine M, Nardini G, Rummukainen K (2013)
Journal of Cosmology and Astroparticle Physics 2013(01): 011.PUB: 2560010 | INSPIRE: 1205001
2014 — article
Kubo relations and radiative corrections for lepton number washout
Bödeker D, Laine M (2014)
Journal of Cosmology and Astroparticle Physics 2014(05): 041.PUB: 2670719 | INSPIRE: 1285499
2012 — article
Production of Prompt Photons: Holographic Duality and Thermalization
Baier R, Stricker SA, Taanila O, Vuorinen A (2012)
Phys.Rev. D 86(8): 081901.PUB: 2518775 | INSPIRE: 1121385
2012 — conference paper
First second of leptons
Schwarz D, Starkman GD, Stuke M (2012)
In: J.Phys.Conf.Ser. 375: 032005.PUB: 2477069 | INSPIRE: 947020
2011 — conference paper
NNLO hard-thermal-loop trace anomaly for QCD
Su N (2011)
In: J.Phys.G: Nucl. Part.Phys. 38: 124104.PUB: 2445516 | INSPIRE: 1083154
2013 — conference paper
Analytical approaches to 2D CDT coupled to matter
Atkin MR, Zohren S (2013)
In: Journal of Physics: Conference Series. 410: 012131.PUB: 2606358 | INSPIRE: 1188673
2014 — article
Completing the picture for the smallest eigenvalue of real Wishart matrices
Akemann G, Guhr T, Kieburg M, Wegner R, Wirtz T (2014)
Physical Review Letters 113(5): 250201.PUB: 2696621 | INSPIRE: 1313132
2012 — article
Three-loop matching coefficients for hot QCD: Reduction and gauge independence
Möller J, Schroeder Y (2012)
JHEP 2012(8): 025.PUB: 2511470 | INSPIRE: 1121393
2012 — article
WIMP abundance and lepton (flavour) asymmetry
Stuke M, Schwarz D, Starkman G (2012)
Journal of Cosmology and Astroparticle Physics 2012(03): 040.PUB: 2477064 | INSPIRE: 946459
2012 — article
Predictions of just-enough inflation
Ramirez E, Schwarz D (2012)
Physical Review D 85(10).PUB: 2443200 | INSPIRE: 1079404
2012 — article
Individual Eigenvalue Distributions for the Wilson Dirac Operator
Akemann G, Ipsen AC (2012)
JHEP 2012(4): 102.PUB: 2468291 | INSPIRE: 1087917
2012 — article
Higher-order ratios of baryon number cumulants
Schaefer B-J, Wagner M (2012)
Central European Journal of Physics 10(6): 1326–1329.PUB: 2540265 | INSPIRE: 1093281
2014 — article
Large-scale structure challenges dilaton gravity in a 5D brane scenario with AdS bulk
Konikowska D (2014)
Classical and Quantum Gravity 31(4): 045011.PUB: 2550682 | INSPIRE: 1082299
2013 — article
Large-angle cosmic microwave background suppression and polarization predictions
Copi CJ, Huterer D, Schwarz D, Starkman GD (2013)
Monthly Notices Of The Royal Astronomical Society 434(4): 3590–3596.PUB: 2575971 | INSPIRE: 1224495
2014 — article
Impact of local structure on the cosmic radio dipole
Rubart M, Bacon D, Schwarz D (2014)
Astronomy & Astrophysics 565: A111.PUB: 2657957 | INSPIRE: 1279887
2014 — article
The value of $H_0$ in the inhomogeneous Universe
Ben-Dayan I, Durrer R, Marozzi G, Schwarz D (2014)
Phys. Rev. Lett. 112(22).PUB: 2657964 | INSPIRE: 1279582
2014 — article
Equation of state in (2+1)-flavor QCD
Bazavov A, Bhattacharya T, DeTar C, Ding H-T, Gottlieb S, Gupta R, Hegde P, Heller UM, Karsch F, Laermann E, Levkova L, et al. (2014)
Physical Review D 90(9).PUB: 2710546 | INSPIRE: 1307761
2014 — article
Evidence for experimentally unobserved strange hadrons from QCD thermodynamics and their impact on freeze-out parameter
Schmidt C (2014)
Nuclear Physics A 931: 820–824.PUB: 2713007 | INSPIRE: 1333988
2014 — article
Instantons and Extreme Value Statistics of Random Matrices
Atkin MR, Zohren S (2014)
Journal of High Energy Physics (4): 118.PUB: 2642744 | INSPIRE: 1242318
2012 — preprint
Universality Conjecture for all Airy, Sine and Bessel Kernels in the Complex Plane
Akemann G, Phillips MJ (2012)
arXiv:1204.2740 .PUB: 2501212 | INSPIRE: 1110869
2014 — preprint
Quark mass dependence of quarkonium properties at finite temperature
Ohno H, Ding H, Kaczmarek O (2014)
arXiv:1412.6594 .PUB: 2717530 | INSPIRE: 1335276
2014 — preprint
Vector spectral functions and transport properties in quenched QCD
Ding H, Kaczmarek O, Meyer F (2014)
arXiv:1412.5869 .PUB: 2717535 | INSPIRE: 1334947
2013 — conference paper
QCD bulk thermodynamics and conserved charge fluctuations with HISQ fermions
Schmidt C (2013)
In: Journal of Physics: Conference Series. 432: 012013.PUB: 2606325 | INSPIRE: 1207890
2012 — conference paper
Automated computation meets hot QCD
Ghisoiu I, Schroeder Y (2012)
In: PoS. LL2012: 063.PUB: 2550990 | INSPIRE: 1191911
2014 — conference paper
On curing the divergences in the quark number susceptibility
Gavai RV, Sharma S (2014)
In: PoS. LATTICE 2014PUB: 2713012 | INSPIRE: 1328964
2012 — article
Thermal right-handed neutrino production rate in the non-relativistic regime
Laine M, Schroeder Y (2012)
JHEP 2012(2): 068.PUB: 2443210 | INSPIRE: 1080134
2012 — article
Charmonium properties in hot quenched lattice QCD
Ding H-T, Francis A, Kaczmarek O, Karsch F, Satz H, Soeldner W (2012)
Phys.Rev. D 86(1): 014509.PUB: 2500421 | INSPIRE: 1112002
2011 — article
Shock wave collisions in AdS5: approximate numerical solutions
Wu B, Romatschke P (2011)
International Journal of Modern Physics C 22(12): 1317–1342.PUB: 2550673 | INSPIRE: 924313
2011 — article
Simplifying 5-point tensor reduction
Fleischer J, Riemann T (2011)
Acta Physica Polonica B 42(11): 2371.PUB: 2550692 | INSPIRE: 946468
2013 — article
Improved Maximum Entropy Analysis with an Extended Search Space
Rothkopf A (2013)
Journal of Computational Physics 238: 106–114.PUB: 2550868 | INSPIRE: 943421
2013 — article
Recent Developments in Lattice Studies for Quarkonia
Kaczmarek O (2013)
Nuclear Physics A 910-911: 98–105.PUB: 2539622 | INSPIRE: 1128273
2012 — article
Taste symmetry breaking at finite temperature
Laermann E, Pucci F (2012)
The European Physical Journal C 72(11): 2200.PUB: 2539634 | INSPIRE: 1124042
2012 — article
Exact chiral invariance at finite density on the lattice
Gavai RV, Sharma S (2012)
Physics Letters B 716(3-5): 446–449.PUB: 2540504 | INSPIRE: 955185
2013 — article
Viscous dark matter growth in (neo-)Newtonian cosmology
Velten H, Schwarz D, Fabris JC, Zimdahl W (2013)
Physical Review D 88(10): 3522.PUB: 2657974 | INSPIRE: 1244297
2014 — preprint
Conjugate gradient solvers on Intel Xeon Phi and NVIDIA GPUs
Kaczmarek O, Schmidt C, Steinbrecher P, Wagner M (2014)
arXiv:1411.4439 .PUB: 2713048 | INSPIRE: 1328508
2012 — conference paper
Center-symmetric effective theory for two-color QCD at high and moderate temperature
Brauner T (2012)
In: PoS. ConfinementX: 181.PUB: 2605467 | INSPIRE: 1238457
2011 — conference paper
Eigenvalue distribution of the Dirac operator at finite temperature with (2+1)-flavor dynamical quarks using the HISQ action
Ohno H, Heller UM, Karsch F, Mukherjee S (2011)
In: PoS. Lattice 2011: 210.PUB: 2473542 | INSPIRE: 945036
2012 — conference paper
Dimensionally reduced QCD at high temperature
Möller J, Schroeder Y (2012)
In: Progress in Particle and Nuclear Physics. 67: 168–172.PUB: 2498090 | INSPIRE: 1115108
2012 — conference paper
New developments in PJFry
Fleischer J, Riemann T, Yundin V (2012)
In: PoS. LL2012: 020.PUB: 2606345 | INSPIRE: 1190696
2012 — conference paper
Width of the QCD transition in a Polyakov-loop DSE model
Horvatić D, Blaschke D, Klabučar D, Kaczmarek O (2012)
In: Acta Physica Polonica B Proceedings Supplement. 5: 925.PUB: 2540930 | INSPIRE: 1202093
2012 — conference paper
Finite volume corrections to LECs in Wilson and staggered ChPT
Akemann G, Pucci F (2012)
In: PoS(Lattice 2012) 264.PUB: 2549449 | INSPIRE: 1207602
2011 — conference paper
CP violation and cold electroweak baryogenesis in the standard model
Brauner T (2011)
In: PoS. EPS-HEP2011: 408.PUB: 2550679 | INSPIRE: 1180318
2014 — article
Hawking-Unruh Hadronization and Strangeness Production in High Energy Collisions
Castorina P, Satz H (2014)
Advances in High Energy Physics 2014: 376982.PUB: 2670713 | INSPIRE: 1285962
2012 — article
Constraints on the NMSSM from the oblique parameters
Maniatis M, Schroeder Y (2012)
Advances in High Energy Physics 2013: 1–7.PUB: 2511474 | INSPIRE: 1121018
2012 — article
Resummation scheme for 3d Yang-Mills and the two-loop magnetic mass for hot gauge theories
Bieletzki D, Lessmeier K, Philipsen O, Schroeder Y (2012)
JHEP 2012(5): 58.PUB: 2498095 | INSPIRE: 1095411
2012 — article
Newtonian versus relativistic cosmology
Flender S, Schwarz D (2012)
Phys.Rev. D 86(6).PUB: 2531953 | INSPIRE: 1121661
2011 — article
Number of Nambu-Goldstone bosons and its relation to charge densities
Watanabe H, Brauner T (2011)
Physical Review D 84(12).PUB: 2550667 | INSPIRE: 930014
2012 — article
A fresh look on three-loop sum-integrals
Schroeder Y (2012)
JHEP 2012(8): 095.PUB: 2538992 | INSPIRE: 1123669
2012 — article
Large diphoton Higgs rates from supersymmetric triplets
Delgado A, Nardini G, Quiros M (2012)
Physical Review D 86(11): 115010.PUB: 2539628 | INSPIRE: 1124056
2012 — article
On the quantum geometry of multi-critical CDT
Atkin MR, Zohren S (2012)
JHEP 2012(11): 037.PUB: 2540891 | INSPIRE: 1094562
2015 — article
Complex Saddle Points and Disorder Lines in QCD at finite temperature and density
Nishimura H, Ogilvie MC, Pangeni K (2015)
Physical Review D 91: 054004.PUB: 2713020 | INSPIRE: 1328636
2012 — preprint
Reduze 2 - Distributed Feynman Integral Reduction
von Manteuffel A, Studerus C (2012)
arXiv:1201.4330 .PUB: 2484760 | INSPIRE: 1085338
2012 — preprint
Sequential suppression of quarkonia and high-energy nucleus-nucleus collisions
Dutta N, Borghini N (2012)
arXiv:1206.2149 .PUB: 2539647 | INSPIRE: 1117861
2013 — preprint
Lack of large-angle TT correlations persists in WMAP and Planck
Copi CJ, Huterer D, Schwarz D, Starkman GD (2013)
arXiv:1310.3831 .PUB: 2658649 | INSPIRE: 1258662
2011 — conference paper
Towards finite density QCD with Taylor expansions
Karsch F, Schaefer B-J, Wagner M, Wambach J (2011)
In: PoS. : 219.PUB: 2444127 | INSPIRE: 943286
2013 — conference paper
Baryon number and charge fluctuations from lattice QCD
Schmidt C (2013)
In: Nuclear Physics A. 904-905: 865c–868c.PUB: 2606330 | INSPIRE: 1207889
2013 — conference paper
Kurtoses and high order cumulants: Insights from resummed perturbation theory
Mogliacci S (2013)
Presented at the Fairness 2013, BerlinPUB: 2642245 | INSPIRE: 1264024
2013 — conference paper
The thermodynamic and the continuum limit of meson screening masses
Kaczmarek O, Laermann E, Müller M (2013)
In: PoS. LATTICE 2013PUB: 2657953 | INSPIRE: 1264676
2013 — article
Cosmic radio dipole from NVSS and WENSS
Rubart M, Schwarz D (2013)
Astronomy & Astrophysics 555: A117.PUB: 2554921 | INSPIRE: 1215736
2013 — article
Does the CMB prefer a leptonic Universe?
Schwarz D, Stuke M (2013)
New Journal of Physics 15(3): 033021.PUB: 2575965 | INSPIRE: 1204580
2014 — article
The QCD chiral transition, $U(1)_{A}$ symmetry and the Dirac spectrum using domain wall fermions
Buchoff MI, Cheng M, Christ NH, Ding H-T, Jung C, Karsch F, Lin Z, Mawhinney R D, Mukherjee S, Petreczky P, Renfrew D, et al. (2014)
Physical Review D 89(5).PUB: 2671953 | INSPIRE: 1254435
2014 — article
The QCD chiral transition, $U(1)_{A}$ symmetry and the Dirac spectrum using domain wall fermions
Buchoff MI, Cheng M, Christ NH, Ding H-T, Jung C, Karsch F, Lin Z, Mawhinney R D, Mukherjee S, Petreczky P, Renfrew D, et al. (2014)
Physical Review D 89(5).PUB: 2671953 | INSPIRE: 1254435
2014 — article
Dynamics of gravitational collapse and holographic entropy production
Keraenen V, Nishimura H, Stricker S, Taanila O, Vuorinen A (2014)
Physical Review D 90(6).PUB: 2701729 | INSPIRE: 1298309
2012 — article
Thermal production of ultrarelativistic right-handed neutrinos: Complete leading-order results
Besak D, Bödeker D (2012)
Journal of Cosmology and Astroparticle Physics 2012(03): 029.PUB: 2484736 | INSPIRE: 1088240
2012 — article
How does color neutrality affect collective modes in color superconductors?
Abuki H, Brauner T (2012)
Physical Review D 85(11).PUB: 2484743 | INSPIRE: 1093275
2012 — article
Signatures of charmonium modification in spatial correlation functions
Karsch F, Laermann E, Mukherjee S, Petreczky P (2012)
Physical Review D 85(11).PUB: 2500397 | INSPIRE: 1094086
2012 — article
On the temperature dependence of the electrical conductivity in hot quenched lattice QCD
Francis A, Kaczmarek O (2012)
Progress in Particle and Nuclear Physics 67(2): 212–217.PUB: 2501869 | INSPIRE: 1082289
2012 — article
Relative information entropy and Weyl curvature of the inhomogeneous Universe
Li N, Buchert T, Hosoya A, Morita M, Schwarz D (2012)
Phys.Rev. D 86(8): 083539.PUB: 2531936 | INSPIRE: 1127712
2013 — article
Constraints on anisotropic cosmic expansion from supernovae
Kalus B, Schwarz D, Seikel M, Wiegand A (2013)
Astronomy & Astrophysics 553: A56.PUB: 2549441 | INSPIRE: 1207515
2013 — article
Exploring the Aoki regime
Akemann G, Pucci F (2013)
JHEP 2013(6): 59.PUB: 2549446 | INSPIRE: 1202994
2012 — article
Computing the temperature dependence of effective CP violation in the standard model
Brauner T, Taanila O, Tranberg A, Vuorinen A (2012)
JHEP 2012(11).PUB: 2528229 | INSPIRE: 1182227
2013 — article
MSSM Electroweak Baryogenesis and LHC Data
Carena M, Nardini G, Quiros M, Wagner CEM (2013)
JHEP 2013(2).PUB: 2539637 | INSPIRE: 1123926
2012 — article
Determination of Freeze-out Conditions from Lattice QCD Calculations
Karsch F (2012)
Central European Journal of Physics 10(6): 1234–1237.PUB: 2540278 | INSPIRE: 1089705
2012 — article
Equation of state at non-zero baryon density based on lattice QCD
Huovinen P, Petreczky P, Schmidt C (2012)
Central European Journal of Physics 10(6): 1385–1387.PUB: 2540280 | INSPIRE: 1089070
2012 — article
FZZT Brane Relations in the Presence of Boundary Magnetic Fields
Atkin MR, Zohren S (2012)
Journal of High Energy Physics 2012(11): 163.PUB: 2540901 | INSPIRE: 1111776
2015 — article
Microscopic origin of U-A(1) symmetry violation in the high temperature phase of QCD
Dick V, Karsch F, Laermann E, Mukherjee S, Sharma S (2015)
Physical Review D 91(9).PUB: 2758220 | INSPIRE: 1345831
2012 — conference paper
CDT coupled to dimer matter: An analytical approach via tree bijections
Atkin MR, Zohren S (2012)
In: AIP Conference Proceedings; 1483. AMER INST PHYSICS: 330–335.PUB: 2539619 | INSPIRE: 1188674
2011 — conference paper
Flux tubes in the SU(3) vacuum
Cardaci MS, Cea P, Cosmai L, Falcone R, Papa A (2011)
In: PoS. Lattice 2011: 323.PUB: 2550874 | INSPIRE: 930235
2012 — article
Dissipation of dark matter
Velten H, Schwarz D (2012)
Phys. Rev. D 86(8): 083501.PUB: 2508727 | INSPIRE: 1117185
2012 — article
Spontaneous breaking of continuous translational invariance
Watanabe H, Brauner T (2012)
Physical Review D 85(8).PUB: 2465939 | INSPIRE: 1081764
2012 — article
Freeze-Out Conditions in Heavy Ion Collisions from QCD Thermodynamics
Bazavov A, Ding H-T, Hegde P, Kaczmarek O, Karsch F, Laermann E, Mukherjee S, Petreczky P, Schmidt C, Smith D, Soeldner W, et al. (2012)
Physical Review Letters 109(19): 192302.PUB: 2542737 | INSPIRE: 1125980
2014 — article
Finite size dependence of scaling functions of the three dimensional O(4) model in an external field
Engels J, Karsch F (2014)
Physical Review D 90(1).PUB: 2670716 | INSPIRE: 1282139
2013 — article
Higher Order Analogues of Tracy-Widom Distributions via the Lax Method
Akemann G, Atkin M (2013)
J.Phys. A 46(1): 015202.PUB: 2530213 | INSPIRE: 1128044
2012 — article
An analytical analysis of CDT coupled to dimer-like matter
Atkin MR, Zohren S (2012)
Physics Letters B 712(4-5): 445–450.PUB: 2517975 | INSPIRE: 1089693
2012 — article
Minimizing Higgs Potentials via Numerical Polynomial Homotopy Continuation
Maniatis M, Mehta D (2012)
European Physical Journal Plus 127(8).PUB: 2484725 | INSPIRE: 1091484
2012 — article
The Light Stop Scenario from Gauge Mediation
Delgado A, Nardini G, Quiros M (2012)
JHEP 2012(4).PUB: 2484770 | INSPIRE: 1085870
2012 — article
Thermal mass and dispersion relations of quarks in the deconfined phase of quenched QCD
Kaczmarek O, Karsch F, Kitazawa M, Soeldner W (2012)
Phys.Rev. D 86(3): 036006.PUB: 2508929 | INSPIRE: 1117894
2012 — article
A new three-loop sum-integral of mass dimension two
Ghisoiu I, Schroeder Y (2012)
JHEP 2012(9): 016.PUB: 2538988 | INSPIRE: 1123919
2012 — article
IBP methods at finite temperature
Nishimura M, Schroeder Y (2012)
JHEP 2012(9): 051.PUB: 2538995 | INSPIRE: 1122861
2012 — article
Faster method of computation of lattice quark number susceptibilities
Gavai R, Sharma S (2012)
Physical Review D 85(5): 054508.PUB: 2540522 | INSPIRE: 1082716
2013 — article
Box ladders in non-integer dimension
Gonzalez I, Kondrashuk I (2013)
Theoretical and Mathematical Physics 177(2): 1515–1539.PUB: 2560025 | INSPIRE: 1189853
2014 — article
Dissipative corrections to particle spectra and anisotropic flow from a saddle-point approximation to kinetic freeze out
Lang C, Borghini N (2014)
The European Physical Journal C 74: 2955.PUB: 2658628 | INSPIRE: 1275652
2013 — article
Massive Nambu-Goldstone Bosons
Watanabe H, Brauner T, Murayama H (2013)
Physical Review Letters 111(2).PUB: 2622281 | INSPIRE: 1222852
2014 — article
Equation of state at finite net-baryon density using Taylor coefficients up to sixth order
Huovinen P, Petreczky P, Schmidt C (2014)
Nuclear Physics A 931: 769–773.PUB: 2720357 | INSPIRE: 1309122
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