Study of the e+e−→ηγ process with Spherical Neutral Detector at the VEPP-2M e+e− collider

Study of the e+e−→ηγ process with Spherical Neutral 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;
physical review d 2006 Vol. 74 pp. 014016-
120
achasov2006physicalstudy

Abstract

In experiment with the SND detector at the VEPP-2M ${e}^{+}{e}^{\ensuremath{-}}$ collider the ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\eta}\ensuremath{\gamma}$ cross section was measured in the center-of-mass energy range $E=0.60--1.38\text{ }\text{ }\mathrm{GeV}$ with the integrated luminosity of $27.8\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$. The measured cross section is well described by the vector meson dominance model with contributions from the $\ensuremath{\rho}(770)$, $\ensuremath{\omega}(783)$, $\ensuremath{\phi}(1020)$, ${\ensuremath{\rho}}^{\ensuremath{'}}(1465)$ resonances and agrees with results of previous measurements. The decay probabilities $\mathcal{B}(\ensuremath{\phi}\ensuremath{\rightarrow}\ensuremath{\eta}\ensuremath{\gamma})$, $\mathcal{B}(\ensuremath{\omega}\ensuremath{\rightarrow}\ensuremath{\eta}\ensuremath{\gamma})$ and $\mathcal{B}(\ensuremath{\rho}\ensuremath{\rightarrow}\ensuremath{\eta}\ensuremath{\gamma})$ were measured with the accuracies better than or comparable to the world averages.

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