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arXiv 0907.4668hep-ph
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QCD手性临界面的研究

Towards the chiral critical surface of QCD

Owe Philipsen

备注：
4 pages, 3 figures, version to appear in proceedings for Quark Matter 2009, March 30-April 4, Knoxville, Tennessee
发表信息：
Nucl.Phys.A830:713c-716c,2009
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摘要：

QCD相图的临界端点通常被认为属于手征临界面，即在{ m_{u,d}，m_s，μ}参数空间中，小质量夸克的一阶手征相变区域的边界是二阶相变面。当μ=0时，具有物理夸克质量的QCD是一个解析交叉，需要手征跃迁的区域随着μ膨胀才能存在临界端点。相反，在N_t=4的粗晶格上，我们发现手征跃迁的面积随着μ的减小而减小，这就排除了在中等化学势μ_B < 500 MeV时QCD的手征临界点。在N_t=6的较细晶格上的初步结果表明临界曲面的曲率与零和不变的结论一致。

英文摘要：

The critical endpoint of the QCD phase diagram is usually expected to belong to the chiral critical surface, i.e. the surface of second order transitions bounding the region of first order chiral phase transitions for small quark masses in the {m_{u,d}, m_s,μ} parameter space. For μ=0, QCD with physical quark masses is known to be an analytic crossover, requiring the region of chiral transitions to expand with μfor a critical endpoint to exist. Instead, on coarse N_t=4 lattices, we find the area of chiral transitions to shrink with μ, which excludes a chiral critical point for QCD at moderate chemical potentials μ_B < 500 MeV. First results on finer N_t=6 lattices indicate a curvature of the critical surface consistent with zero and unchanged conclusions.

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