Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-10-30
Phys.Rev.D81:014028,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages, 11 figures; final version published in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.81.014028
We study fluctuations of conserved charges including baryon number, electric charge, and strangeness as well as the correlations among these conserved charges in the 2+1 flavor Polyakov--Nambu--Jona-Lasinio model at finite temperature. The calculated results are compared with those obtained from recent lattice calculations performed with an improved staggered fermion action at two values of the lattice cutoff with almost physical up and down quark masses and a physical value for the strange quark mass. We find that our calculated results are well consistent with those obtained in lattice calculations except for some quantitative differences for fluctuations related with strange quarks. Our calculations indicate that there is a pronounced cusp in the ratio of the quartic to quadratic fluctuations of baryon number, i.e. $\chi_{4}^{B}/\chi_{2}^{B}$, at the critical temperature during the phase transition, which confirms that $\chi_{4}^{B}/\chi_{2}^{B}$ is a useful probe of the deconfinement and chiral phase transition.
Fu Wei-jie
Liu Yu-Xin
Wu Yue-Liang
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