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arXiv 0907.4624hep-lat
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高温下QCD中电荷涨落的高阶矩

Higher moments of charge fluctuations in QCD at high temperature

C. Miao

摘要:

我们给出了重子数、奇异性和电荷涨落的晶格结果,以及它们在有限温度和消失化学势(即在与RHIC和LHC相关的条件下)的相关性。我们发现,波动迅速变化的转变温度$T_c$和接近理想的夸克气体极限已经在大约$1.5T_c$。这表明夸克是携带$T\geq 1.5T_c$守恒电荷量子数的相关自由度。在低温下,晶格结果的定性特征很好地描述了强子共振气体模型。

英文摘要:

We present lattice results for baryon number, strangeness and electric charge fluctuations as well as their correlations at finite temperature and vanishing chemical potentials, i.e. under conditions relevant for RHIC and LHC. We find that the fluctuations change rapidly at the transition temperature $T_c$ and approach the ideal quark gas limit already at approximately $1.5T_c$. This indicates that quarks are the relevant degrees of freedom that carry the quantum numbers of conserved charges at $T\geq 1.5T_c$. At low temperature, qualitative features of the lattice results are well described by a hadron resonance gas model.

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