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arXiv 0811.1006hep-lathep-ph
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高温下QCD的重子数、奇异度和电荷涨落

Baryon Number, Strangeness and Electric Charge Fluctuations in QCD at High Temperature

M. Cheng, P. Hegde, C. Jung, F. Karsch, O. Kaczmarek, E. Laermann, R. D. Mawhinney, C. Miao, P. Petreczky, C. Schmidt, W. Soeldner

摘要:

我们分析了高温下QCD中重子数、奇异数和电荷涨落及其关联。我们目前的结果进行了改进的交错费米子行动(p4行动)在两个值的晶格截止几乎物理上下夸克质量和奇怪的夸克质量的物理值的晶格计算。我们将这些结果与高温下的理想夸克气体和低温下的强子共振气体模型进行了比较。我们发现,波动和相关性很好地描述了前者已经为约1.5倍的转变温度的温度。在低温下,晶格结果的定性特征可以用强子共振气体模型很好地描述。高阶累积量,这变得越来越敏感的轻介子,然而,显示偏离共振气体在附近的转变温度。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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