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Achasov, M N; Aulchenko, V M; A Yu Barnyakov; Beloborodov, K I; Berdyugin, A V; Berkaev, D E; Bogdanchikov, A G; Botov, A A; Dimova, T V; Druzhinin, V P; Golubev, V B; Kardapoltsev, L V; Kasaev, A S; Kharlamov, A G; Kirpotin, A N; Koop, I A; Korol, A A; Koshuba, S V; Kovrizhin, D P; Kupich, A S; Martin, K A; N Yu Muchnoi; Obrazovsky, A E; Otboev, A V; Pakhtusova, E V; Senchenko, A I; Serednyakov, S I; P Yu Shatunov; Shatunov, Yu M; Shtol, D A; Shwartz, D B; Silagadze, Z K; Surin, I K; Tikhonov, Yu A; Usov, Yu V; Vasiljev, A V; Zemlyansky, I M
arXiv.org, 04/2015Paper
A search for the process \(e^+e^- \to \eta^\prime\) has been performed with the SND detector at the VEPP-2000 \(e^+e^-\) collider. The data were accumulated at the center-of-mass energy of \(957.78\pm 0.06\) MeV with an integrated luminosity of about 2.9 pb\(^{-1}\). For reconstruction of the \(\eta^\prime\) meson five decay chains have been used: \(\eta^{\prime}\to\eta\pi^+\pi^-\) followed by the \(\eta\) decays to \(\gamma\gamma\) and \(3\pi^0 \), and \(\eta^{\prime} \to \eta\pi^0\pi^0\) followed by the \(\eta\) decays to \(\pi^+\pi^-\pi^0\), \(\gamma\gamma\), and \(3\pi^0\). As a result, the upper limit has been set on the \(\eta^\prime\) electronic width: \(\Gamma_{\eta^{\prime}\to e^+e^-} < 0.0020\) eV at the 90\% confidence level.
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