RADIATIVE DECAYS OF PSEUDOSCALAR (P) AND VECTOR (V) MESONS AND THE PROCESSES e+e- → ηρ(ω) AND e+e- → ϕη(η')

Abstract

Radiative decays of pseudoscalar and vector mesons are calculated in the frames of chiral Nambu–Jona-Lasinio (NJL) model. We use triangle quark loops of anomalous type. During the evaluation of this loop integrals we used two methods. In the first method we neglect the dependence of external momenta. In that case we reproduce the Wess–Zumino–Witten terms of effective chiral meson Lagrangian. In the second method we take into account the momenta dependence of loop integrals omitting their imaginary part. This enables us to take into account quark confinement. The application of both methods are in qualitative agreement with each other and with experimental data. The second method allows us to describe the electron–positron annihilation with production pseudoscalar and vector mesons in center-of-mass energy range from 1 to 5 GeV. Comparisons with the recent experimental data are presented.