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Search for $a_0(980)$ and $f_0(980)$ mesons in $ϕ\toγK\bar K$

N. N. Achasov·V. V. Gubin
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Abstract

We study the decay $ϕ\toγK^+K^-$ taking into account the scalar mesons production $ϕ\toγ(f_0+a_0) \toγK^+K^-$ and the final state radiation. We note that the relative sign between the final state radiation amplitude and the scalar meson production amplitude is fixed in the $K^+K^-$ loop model which describes data on the $ϕ\to γf_0\toγππ$ and $ϕ\toγa_0\toγπη$ decays. As consequence this model predicts the definite interference between the final state radiation and the scalar resonance production amplitudes. We calculate the mass spectra of the $ϕ\toγK^+K^-$ decay and the differential cross-sections for $e^+e^-\toϕ\toγK^+K^-$ and for $e^+e^-\toϕ\toγK^0\bar K^0$ reactions.

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N. N. Achasov, V. V. Gubin. 2001-11-04. Search for $a_0(980)$ and $f_0(980)$ mesons in $ϕ\toγK\bar K$. https://doi.org/10.1103/physrevd.64.094016

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