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Equation of state and QCD transition at finite temperature

Mar, 2009

31 pages

Published in:

Phys.Rev.D 80 (2009) 014504

e-Print:

0903.4379 [hep-lat]

DOI:

10.1103/PhysRevD.80.014504

Report number:

CU-TP-1189

View in:

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Abstract: (arXiv)

We calculate the equation of state in 2+1 flavor QCD at finite temperature with physical strange quark mass and almost physical light quark masses using lattices with temporal extent Nt=8. Calculations have been performed with two different improved staggered fermion actions, the asqtad and p4 actions. Overall, we find good agreement between results obtained with these two O(a^2) improved staggered fermion discretization schemes. A comparison with earlier calculations on coarser lattices is performed to quantify systematic errors in current studies of the equation of state. We also present results for observables that are sensitive to deconfining and chiral aspects of the QCD transition on Nt=6 and 8 lattices. We find that deconfinement and chiral symmetry restoration happen in the same narrow temperature interval. In an Appendix we present a simple parametrization of the equation of state that can easily be used in hydrodynamic model calculations. In this parametrization we also incorporated an estimate of current uncertainties in the lattice calculations which arise from cutoff and quark mass effects. We estimate these systematic effects to be about 10 MeV

Note:

31 pages, 24 EPS-figures

12.38.Gc
11.15.Ha
quantum chromodynamics: critical phenomena
quark: mass
fermion: staggered
symmetry: chiral
flavor: 3
equation of state: parametrization
lattice field theory
finite temperature: action

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