文章基本信息

标题：Explanation for baryon mass puzzle in strong coupling limit of lattice QCD
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作者：K. Miura
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2008
卷号：2008
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We investigate the phase diagram and the baryon mass (MB) in the color SU(Nc = 3) strong coupling lattice QCD with one species of staggered fermions at finite quark chemical potential (m) and/or finite temperature (T). In particular, their evolution with the finite coupling (1=g2) is studied in the next to leading order of the strong coupling expansion. We formulate the treatment of the temporal plaquette effects by introducing some new kinds of mean fields, which lead to the suppression of m and the constituent quark mass (mq). These energy scale modifications cause the following phase diagram evolution: (1) The ratio of the critical value (mc=Tc) becomes closer to the empirical value. (2) As the coupling decreases, the second order transition at zero chemical potential evolves to the first order, and the critical temperature Tc is found to be consistent with lattice Monte-Carlo simulations. The same suppression mechanism of m also modifies the analytic relation between the baryon mass MB and the critical baryon chemical potential (Ncmc). We show that the ratio Ncmc=MB grows as the coupling decreases, and this trend may be helpful to form the nuclear matter in the current frame work.