Baryon number, strangeness, and electric charge fluctuations in QCD at high temperature
- Physics Department, Columbia University, New York, New York 10027 (United States)
- Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York 11790 (United States)
- Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
- Fakultaet fuer Physik, Universitaet Bielefeld, D-33615 Bielefeld (Germany)
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 cutoff 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.
- OSTI ID:
- 21308186
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 79, Issue 7; Other Information: DOI: 10.1103/PhysRevD.79.074505; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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