Critical surface of the SU(3)(L) x SU(3)(R) chiral quark model at nonzero baryon density

Abstract

The boundary of the first order chiral phase transition region is studied in the m(pi)-m(K)-mu(B) space using the one-loop optimized perturbation theory for the resummation of the perturbative series. Chiral perturbation theory for mesons and baryons is used for the T=0 parametrization of the model. The surface of second order transition points bends with increasing mu(B) towards the physical point of the m(pi)-m(K) mass plane allowing for the existence of the critical end point in the mu(B)-T plane at the physical point. The location and scaling region of the CEP is explored.