Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2008-11-06
Physics
High Energy Physics
High Energy Physics - Lattice
11 pages, 8 figures; revised and published version
Scientific paper
We analyze baryon number, strangeness and electric charge fluctuations as well as their correlations in QCD at high temperature. We present results obtained from lattice calculations performed with an improved staggered fermion action (p4-action) at two values of the lattice cut-off with almost physical up and down quark masses and a physical value for the strange quark mass. We compare these results, with an ideal quark gas at high temperature and a hadron resonance gas model at low temperature. We find that fluctuations and correlations are well described by the former already for temperatures about 1.5 times the transition temperature. At low temperature qualitative features of the lattice results are quite well described by a hadron resonance gas model. Higher order cumulants, which become increasingly sensitive to the light pions, however show deviations from a resonance gas in the vicinity of the transition temperature.
Cheng Mowei
Hegde Prasad
Jung Chulwoo
Kaczmarek Olaf
Karsch Frithjof
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