Theoretical studies of the reaction e+ e- --> K+ K- gamma

TL;DR

This paper provides a theoretical analysis of the e+ e- --> K+ K- gamma reaction near the phi(1020) resonance, considering various mechanisms and interaction effects to predict mass distributions and angular dependencies.

Contribution

It introduces a comprehensive theoretical model including strong interaction amplitudes, initial and final state radiation, and interference effects for the reaction.

Findings

Calculated K+K- effective mass distributions

Predicted angular dependence of the cross-section

Included interference effects in the transition matrix

Abstract

We present studies of the e+ e- --> K+ K- gamma reaction for the e+e- center-of-mass energies close to the phi(1020) meson mass. Different mechanisms leading to the final state are considered. The strong interaction amplitudes of the K+K- pairs in the S-wave are taken into account. In addition, the photon emission in the initial state, the final state radiation effects and all the possible interference terms are included in the transition matrix elements. The K+K- effective mass distributions and the angular dependence of the reaction cross-section are calculated.