Strong interaction between kaons in the reactions e+ e- --> K+ K- gamma and e+ e- --> K0 K0bar gamma

TL;DR

This paper develops a theoretical model for e+ e- reactions producing kaon pairs with a photon, incorporating strong K Kbar interactions, and provides detailed predictions for cross sections, distributions, and decay branching fractions.

Contribution

It introduces a comprehensive model that accounts for strong K Kbar interactions in these reactions, unifying previous models as special cases and extending to other similar processes.

Findings

Derived formulae for differential cross sections and angular distributions.

Numerical results for transition amplitudes and branching fractions.

Model generalization to other meson-photon reactions.

Abstract

A theoretical model of the reactions e+ e- --> K+ K- gamma and e+ e- --> K0 K0bar gamma has been derived. The strong interaction between kaons is taken into account using a general form of the K Kbar scattering amplitude. It is shown that some models formulated in the past are particular cases of the present approach. The formulae for the K Kbar effective mass dependence of the differential cross section as well as for the angular kaon and photon distributions and for the branching fractions of the phi(1020)--> K+ K- gamma and phi(1020)--> K0 K0bar gamma decays have been obtained. We present numerical results for the functions entering into transition amplitudes, K Kbar effective mass distributions, total cross sections, and branching fractions. Finally, the model is generalized to treat other reactions with two pseudoscalar mesons accompanying a photon in the final state.