Non-Gaussian fluctuations near the QCD critical point.
Non-Gaussian fluctuations near the QCD critical point.
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DOI：
10.1103/physrevlett.102.032301
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发表时间：
2008-09
影响因子：
8.6
通讯作者：
M. Stephanov
中科院分区：
文献类型：
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作者：
M. Stephanov
研究了QCD临界点对重离子碰撞中实验观测值涨落的非高斯矩（累积量）的影响。我们发现这些矩对临界点的接近非常敏感，正如相关长度xi的大小所测量的那样。例如，三次多重中心矩（deltaN）3近似为xi4.5，四次累积量（deltaN）4c近似为xi7。我们估计了临界点对介子和质子多重度的非高斯波动的贡献幅度。
We study the effect of the QCD critical point on non-Gaussian moments (cumulants) of fluctuations of experimental observables in heavy-ion collisions. We find that these moments are very sensitive to the proximity of the critical point, as measured by the magnitude of the correlation length xi. For example, the cubic central moment of multiplicity (deltaN)3 approximately xi4.5 and the quartic cumulant (deltaN)4c approximately xi7. We estimate the magnitude of critical point contributions to non-Gaussian fluctuations of pion and proton multiplicities.