Strong interaction between kaons in the reactions e+e−→K+K

Abstract

A theoretical model of the reactions e + e − → K + K − γ and e + e − → K 0K 0 γ has been derived. The strong interaction between kaons is taken into account using a general form of the KK scattering amplitude. It is shown that some models formulated in the past are particular cases of the present approach. The formulae for the KK 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 φ(1020) → K + K − γ and φ(1020) → K 0K 0 γ decays have been obtained. We present numerical results for the functions entering into transition amplitudes, KK 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.