Study of the processe+e−→ηγin the center-of-mass energy range 1.07–2.00 GeV
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology2014Vol. 90(3)
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M. N. Achasov, V.M. Aulchenko, A. Barnyakov, K. Beloborodov, A. V. Berdyugin, A. G. Bogdanchikov, A. A. Botov, T. Dimova, V. P. Druzhinin, V. B. Golubev, K. Grevtsov, L. Kardapoltsev, A. G. Kharlamov, D. P. Kovrizhin, I. A. Koop, A. A. Korol, S. V. Koshuba, А. П. Лысенко, K. A. Martin, A. E. Obrazovsky, Е. В. Пахтусова, E. A. Perevedentsev, А. Романов, S. I. Serednyakov, З. К. Силагадзе, A.N. Skrinsky, I. K. Surin, Yu. A. Tikhonov, A. V. Vasiljev, P. Yu. Shatunov, Yu. M. Shatunov, D. A. Shtol
Abstract
The ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\eta}\ensuremath{\gamma}$ cross section has been measured in the center-of-mass energy range 1.07--2.00 GeV using the decay mode $\ensuremath{\eta}\ensuremath{\rightarrow}3{\ensuremath{\pi}}^{0}$, ${\ensuremath{\pi}}^{0}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}$. The analysis is based on $36\text{ }\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ of integrated luminosity collected with the SND detector at the VEPP-2000 ${e}^{+}{e}^{\ensuremath{-}}$ collider. The measured cross section of about 40 pb at 1.5 GeV is explained by decays of the $\ensuremath{\rho}(1450)$ and $\ensuremath{\phi}(1680)$ resonances.
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