Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-07-27
Nucl.Phys.A830:713c-716c,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 3 figures, version to appear in proceedings for Quark Matter 2009, March 30-April 4, Knoxville, Tennessee
Scientific paper
10.1016/j.nuclphysa.2009.10.064
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,\mu} parameter space. For \mu=0, QCD with physical quark masses is known to be an analytic crossover, requiring the region of chiral transitions to expand with \mu for a critical endpoint to exist. Instead, on coarse N_t=4 lattices, we find the area of chiral transitions to shrink with \mu, which excludes a chiral critical point for QCD at moderate chemical potentials \mu_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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