eta, eta-prime --> pi+ pi- l+ l- in a chiral unitary approach

Abstract

The decays eta, eta-prime --> pi+ pi- l+ l- (with l = e, mu) are investigated within a chiral unitary approach which combines the chiral effective Lagrangian with a coupled-channels Bethe-Salpeter equation. Predictions for the decay widths and spectra are given.

Comments: 22 pages, 7 figures, 5 tables; additional material added and figures 6,7 revised