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

TL;DR

This paper investigates eta and eta-prime decays into pi+ pi- l+ l- using a chiral unitary approach, providing predictions for decay widths and spectra based on a combined theoretical framework.

Contribution

It introduces a novel application of the chiral unitary approach to eta and eta-prime decays into four-particle final states, integrating chiral Lagrangian with coupled-channels Bethe-Salpeter equations.

Findings

Predicted decay widths for eta and eta-prime decays.

Calculated decay spectra for different lepton flavors.

Demonstrated the effectiveness of the chiral unitary approach in these decays.

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.