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Study of the $e^+e^-\toηγ$ process with SND detector at the VEPP-2M $e^+e^-$ collider

M. N. Achasov·V. M. Aulchenko·K. I. Beloborodov·A. V. Berdyugin·A. G. Bogdanchikov·A. V. Bozhenok·D. A. Bukin·T. V. Dimova·V. P. Druzhinin·V. B. Golubev·A. A. Korol·S. V. Koshuba·A. V. Otboev·E. V. Pakhtusova·S. I. Serednyakov·Yu. M. Shatunov·V. A. Sidorov·Z. K. Silagadze·A. N. Skrinsky·A. V. Vasiljev
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Abstract

In experiment with the SND detector at VEPP-2M $e^+e^-$ collider the $e^+e^-\toηγ$ cross section was measured in the energy range $E$=0.60--1.38 GeV with the integrated luminosity of 27.8 pb$^{-1}$. The measured cross section is well described by the vector meson dominance model with contributions from the $ρ(770)$, $ω(783)$, $ϕ(1020)$, $ρ^{\prime}(1465)$ resonances and agrees with results of previous measurements. The decay probabilities $\BR(ϕ\toηγ)$, $\BR(ω\toηγ)$ and $\BR(ρ\toηγ)$ were measured with the accuracies better than or comparable to the world averages.

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M. N. Achasov, V. M. Aulchenko, K. I. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, A. V. Bozhenok, D. A. Bukin, T. V. Dimova, V. P. Druzhinin, V. B. Golubev, A. A. Korol, S. V. Koshuba, A. V. Otboev, E. V. Pakhtusova, S. I. Serednyakov, Yu. M. Shatunov, V. A. Sidorov, Z. K. Silagadze, A. N. Skrinsky, A. V. Vasiljev. 2006-06-27. Study of the $e^+e^-\toηγ$ process with SND detector at the VEPP-2M $e^+e^-$ collider. https://doi.org/10.1103/physrevd.74.014016

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