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.
Highlights
A measurement of the e+e− → K+K−γ transition could provide a new information about the KKstrong interactions near threshold as well as about the structure of the f0(980) and a0(980) scalar mesons
The squares of the momentum transfers t1 and t are related to the K− and photon polar angles θ1 and θγ, defined in the e+e− center-of-mass frame with the z-axis chosen along the e− momentum: t1
The K−γ effective mass is related to K− polar angle θ1∗ defined with respect to the direction of the photon momentum in the K+K− center-of-mass frame (v being the K− velocity): m2K−γ
Summary
A measurement of the e+e− → K+K−γ transition could provide a new information about the KKstrong interactions near threshold as well as about the structure of the f0(980) and a0(980) scalar mesons. For the e+e− → K0K0γ branching fraction only the upper limit 1.9 · 10−8 is known [4] and the branching fraction for the φ(1020) meson decay into the K+K−γ channel is yet unknown.
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