Speaker
Description
By considering the one loop background field method for the quark-antiquark interaction mediated by non perturbative one-gluon exchange, U(3) flavor dependent corrections to the NJL-model coupling constant are derived in the local limit. Meson and quark mixing(s) are discussed, basically emerging due to the different representations in which quarks and quark-antiquark meson are defined. These mixing(s) induce a sizeable role of the sea quark-antiquark states by means of the quark condensates of all flavors. Due to this, it is possible to show a strangeness (and heavier flavor) content of light mesons such as pions and scalar quark-antiquark states. Consequences for observables usually calculated with the NJL-model are presented by neglecting the mixing interactions. The 6th order interactions for the scalar and pseudoscalar quark currents are of the same shape of the 't Hooft determinantal interactions for the flavor U(3) model. However, further structures emerge from vacuum polarization.
