Study of the decay phi --> pi+pi-pi0 with the KLOE detector

TL;DR

This paper analyzes the decay process phi --> pi+pi-pi0 using the KLOE detector, extracting rho-meson parameters, amplitude ratios, and cross-sections at the phi resonance energy.

Contribution

It provides new measurements of rho-meson parameters and decay amplitudes in phi decays, enhancing understanding of meson interactions.

Findings

Determined rho-meson parameters for all charge states.

Measured relative decay amplitudes of phi --> rhopi and phi --> pi+pi-pi0.

Calculated the e+e- --> omega pi0 cross-section at the phi peak.

Abstract

We present a study of the reaction e+e- --> pi+pi-pi0 at the phi peak W=M(phi)=1019.4 MeV observed with the KLOE detector at Dafne. The reaction is dominated by phi production and decay, e+e- --> phi --> pi+pi-pi0. From a fit to the Dalitz plot density distribution we obtain the rho-meson parameters for its three charge states. We also find the relative amplitudes for phi --> rhopi and phi -> pi+pi-pi0 and the cross-section for e+e- --> omega pi0 with omega --> pi+pi-.