Abstract
Recent theoretical studies of the e+e- → K+K-γ process are described. Three main reaction mechanisms are considered: the initial state radiation, the final state radiation and the strong interaction between the outgoing K+K- mesons. The K+K- effective mass distributions are derived for three different models which in past have been used for a description of the e+e- → π+π-η data. Also the numerical results for the angular photon and kaon distributions are presented. A new model of the e+e- → M1M2γ reactions is outlined which can serve for multichannel analyses of the radiative processes with a production of two pseudoscalar mesons M1 and M2.
Highlights
Strong interactions of the strange mesons K+ and K−at low energies are not well known
Since the K+K− threshold lies quite close to the DAΦNE accelerator energy, the low energy K+K− interactions can be studied using data collected by the KLOE experiment
In other process, called the final state radiation (FSR), the outgoing photon is emitted from the K+ or from the K− meson, or directly from the same vertex connecting K+ and K− with γ∗
Summary
Strong interactions of the strange mesons K+ and K−at low energies are not well known. Let us stress here that the parameters of the scalar resonances found in experimental analyses are very much model dependent. If the fits to data are performed with two different production functions P(m) the fitted parameters of the resonant amplitude D(m) could be different as well. This is one possible source of the model dependence found in experimental analyses. The corresponding ratios of the widths are: Γ( f0(980)γ)/Γtotal = (3.22 ± 0.19) · 10−4 and Γ(a0(980)γ)/Γtotal = (7.6 ± 0.6) · 10−5 [1] Since both scalar resonances decay into K+K− mesons, one should experimentally observe the reaction e+e− → K+K−γ. The proposed experimental analysis could provide us with potentially interesting results
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