标题： 强子共振质量谱与格点QCD热力学 显示英文标题

标题： Hadron Resonance Mass Spectrum and Lattice QCD Thermodynamics

摘要： 我们研究了从强子相到夸克-胶子等离子体转变的格点QCD结果，并将其与强子共振气体模型和渗流模型进行了对比。 我们提出，对于T < T_c的情况，(2+1)味夸克海蒙特卡洛模拟得到的态方程可以用强子共振气体很好地描述。 我们检验了格点上强子谱对夸克质量的依赖性，并讨论了用MIT袋模型描述它的方法。 这被用来制定一个适用于任意夸克质量的共振气体模型，该模型可以与格点计算结果进行比较。 最后，我们应用这个模型来分析格点计算得到的临界温度随夸克质量的变化。 我们证明不同夸克质量下的T_c值与强子共振气体中的恒定能量密度线一致。 对于较大的夸克质量，需要加入胶球共振气体的相应贡献。 显示英文摘要

摘要： We confront lattice QCD results on the transition from the hadronic phase to the quark--gluon plasma with hadron resonance gas and percolation models. We argue that for T < T_c the equation of state derived from Monte--Carlo simulations of (2+1) quark--flavor QCD can be well described by a hadron resonance gas. We examine the quark mass dependence of the hadron spectrum on the lattice and discuss its description in terms of the MIT bag model. This is used to formulate a resonance gas model for arbitrary quark masses which can be compared to lattice calculations. We finally apply this model to analyze the quark mass dependence of the critical temperature obtained in lattice calculations. We show that the value of T_c for different quark masses agrees with lines of constant energy density in a hadron resonance gas. For large quark masses a corresponding contribution from a glueball resonance gas is required.