Complete one-loop parametrization of the linear sigma model is performed and the phase boundary between first order and crossover transition regions of the mπ-mK-plane is determined using the optimized perturbation theory as a resummation tool of perturbative series. Away from the physical point the parameters of the model were determined by making use of chiral perturbation theory. Along the diagonal mπ=mK of the mass plane we estimate mπc=110±20MeV. The location of the tricritical point on the mπ=0 axis is estimated in the interval mKTCP (17001850)MeV.
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|Publication status||Published - 2006|
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)