QCD Crossover at Finite Chemical Potential from Lattice Simulations.
QCD Crossover at Finite Chemical Potential from Lattice Simulations.
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DOI：
10.1103/physrevlett.125.052001
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发表时间：
2020-02
影响因子：
8.6
通讯作者：
S. Borsányi;Z. Fodor;J. Guenther;R. Kara;S. Katz;P. Parotto;A. Pásztor;C. Ratti;K. Szabó
中科院分区：
文献类型：
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作者：
S. Borsányi;Z. Fodor;J. Guenther;R. Kara;S. Katz;P. Parotto;A. Pásztor;C. Ratti;K. Szabó
我们提供了迄今为止QCD跃迁线的最精确的结果。我们优化了交叉温度T_{c}的定义，使其非常精确地确定，并从虚化学势外推到真实的μ_{B}~ 300 MeV。本文采用的T_{c}的定义是基于观察到手征磁化率作为凝聚体的函数在零和虚μ_{B}处是一条几乎普适的曲线。我们在具有物理夸克质量的N_{t}=10，12，16格点上，通过连续外推得到了参数κ_{2}=0.0153（18）和κ_{4}=0.00032（67）。我们还外推了手征极化率的峰值和手征跃迁沿着交叉线的宽度。实际上，这两个方程都与μ_{B}的常数函数相一致.我们在探索的范围内没有看到任何临界迹象。
We provide the most accurate results for the QCD transition line so far. We optimize the definition of the crossover temperature T_{c}, allowing for its very precise determination, and extrapolate from imaginary chemical potential up to real μ_{B}≈300 MeV. The definition of T_{c} adopted in this work is based on the observation that the chiral susceptibility as a function of the condensate is an almost universal curve at zero and imaginary μ_{B}. We obtain the parameters κ_{2}=0.0153(18) and κ_{4}=0.00032(67) as a continuum extrapolation based on N_{t}=10, 12, 16 lattices with physical quark masses. We also extrapolate the peak value of the chiral susceptibility and the width of the chiral transition along the crossover line. In fact, both of these are consistent with a constant function of μ_{B}. We see no sign of criticality in the explored range.