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arXiv 1508.07599hep-lathep-phnucl-th
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2+1风味QCD的临界线：朝向连续极限

Critical line of 2+1 flavor QCD: Toward the continuum limit

Paolo Cea, Leonardo Cosmai, Alessandro Papa

备注：
10 pages, 4 figures, 16 tables; modified title and abstract, added two tables and a few comments in the text, added appendix with 13 tables; version to appear on Phys. Rev. D
发表信息：
Phys. Rev. D 93, 014507 (2016)
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摘要：

在非零温度和夸克密度条件下，确定了$n_f$ =2+1交错费米子的QCD赝临界线曲率的连续极限.我们进行Monte Carlo模拟在假想的重子化学势，采用HISQ/树作用离散化，在代码中实现的MILC合作。调整联轴器，使其在恒定物理线上移动，如参考文献~ \cite{Bazavov:2011nk}，奇异夸克质量$m_s$固定在它的物理值，光与奇异质量比为$m_l/m_s=1/20$。化学势对于三种夸克$μ_l=μ_s\equiv μ$设定为相同的值。我们尝试外推到连续使用的结果与时间大小的格子$L_t=12$。我们估计的连续值的曲率$κ$在零重子密度，$κ=0.020(4)$，最近的晶格结果和实验测定的冻结曲线进行了比较。

英文摘要：

We determine the continuum limit of the curvature of the pseudocritical line of QCD with $n_f$=2+1 staggered fermions at nonzero temperature and quark density. We perform Monte Carlo simulations at imaginary baryon chemical potentials, adopting the HISQ/tree action discretization, as implemented in the code by the MILC collaboration. Couplings are adjusted so as to move on a line of constant physics, as determined in Ref.~\cite{Bazavov:2011nk}, with the strange quark mass $m_s$ fixed at its physical value and a light-to-strange mass ratio $m_l/m_s=1/20$. The chemical potential is set at the same value for the three quark species, $μ_l=μ_s\equiv μ$. We attempt an extrapolation to the continuum using the results on lattices with temporal size up to $L_t=12$. Our estimate for the continuum value of the curvature $κ$ at zero baryon density, $κ=0.020(4)$, is compared with recent lattice results and with experimental determinations of the freeze-out curve.

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