Search

By solving the Dyson-Schwinger equations and analyzing the obtained mass function, we compute the quark condensate beyond the chiral limit with a cutoff independent definition. The definition explicitly separates the quadratic and logarithmic divergence from the condensate, even for very large quark mass. With this well-defined condensate, we then analyze the evolution of the condensate and its susceptibility with the current quark mass. The susceptibility shows a critical mass at about ΛQCD, which defines a transition boundary for internal hadron dynamics. [ABSTRACT FROM AUTHOR]

The in-medium behavior of ground-state qq mesons, where q∈{u,d,s,c}, in vector and axial-vector channels is studied based on the spectral analysis for mesonic correlators at finite temperature and zero chemical potential. We first compute the correlators by solving the quark gap equations and the inhomogeneous Bethe-Salpeter equations in the rainbow-ladder approximation. Using a phenomenological ansatz, the spectral functions are extracted by fitting the correlators. By analyzing the evolution of the spectral functions with the temperature, we obtain the dissociation temperatures of mesons and discuss their relations to the critical temperature of the chiral symmetry restoration. The results show a pattern of flavor dependence of the thermal dissociation of the mesons. [ABSTRACT FROM AUTHOR]