Hadronic fluctuations at the QCD phase transition
Hadronic fluctuations at the QCD phase transition
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DOI：
10.1016/j.physletb.2005.11.083
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发表时间：
2005-09
影响因子：
4.4
通讯作者：
S. Ejiri;S. Ejiri;F. Karsch;F. Karsch;K. Redlich;K. Redlich
中科院分区：
文献类型：
--
作者：
S. Ejiri;S. Ejiri;F. Karsch;F. Karsch;K. Redlich;K. Redlich
讨论了同位旋对称物质在零夸克化学势下QCD跃迁附近强子涨落的性质，即净夸克数、同位旋数和电荷的涨落。我们分析了这些涨落的二阶和四阶累积量，并认为四次累积量和二次累积量的比率分别反映了携带夸克数、同位旋或电荷的相关自由度。在强子相，我们发现双电荷强子对热力学的贡献导致了电荷涨落的增强。高温阶段的涨落被迅速抑制，表明在QGP中，净夸克数和电荷主要由准粒子携带，量子数为夸克。
We discuss the properties of hadronic fluctuations, i.e., fluctuations of net quark and isospin numbers as well as electric charge, in the vicinity of the QCD transition in isospin-symmetric matter at vanishing quark chemical potential. We analyse second- and fourth-order cumulants of these fluctuations and argue that the ratio of quartic and quadratic cumulants reflects the relevant degrees of freedom that carry the quark number, isospin or charge, respectively. In the hadronic phase we find that an enhancement of charge fluctuations arises from contributions of doubly charged hadrons to the thermodynamics. The rapid suppression of fluctuations seen in the high-temperature phase suggests that in the QGP, net quark number and electric charge are predominantly carried by quasi-particles, with the quantum numbers of quarks.