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Achasov, M N; A Yu Barnyakov; K I Beloborodov A V Berdyugin; Bogdanchikov, A G; Botov, A A; Dimova, T V; Druzhinin, V P; Golubev, V B; Kardapoltsev, L V; Kharlamov, A G; Koop, I A; Korneev, L A; Korol, A A; Kovrizhin, D P; Kupich, A S; Lysenko, A P; Martin, K A; N Yu Muchnoi; Obrazovsky, A E; Pakhtusova, E V; Perevedentsev, E A; Rogovsky, Yu A; Senchenko, A I; Serednyakov, S I; Silagadze, Z K; Shatunov, Yu M; Shtol, D A; Shwartz, D B; Skrinsky, A N; Surin, I K; Tikhonov, Yu A; Usov, Yu V; Vasiljev, A V; Zemlyansky, I M
arXiv.org, 07/2015Paper
A sensitivity of the VEPP-2000 \(e^+e^-\) collider in a search for the rare decay \(\eta \rightarrow e^+ e^-\) has been studied. The inverse reaction \(e^+ e^- \rightarrow \eta\) is proposed for this search. We have analyzed a data sample with an integrated luminosity of 108 nb\(^{-1}\) collected with the SND detector in the center-of-mass energy range 520-580 MeV and found no background events for the reaction \(e^+ e^- \rightarrow \eta\) in the decay mode \(\eta\to\pi^0\pi^0\pi^0\). In the absence of background, a sensitivity to \({\cal B}(\eta \rightarrow e^+ e^-)\) of \(10^{-6}\) can be reached during two weeks of VEPP-2000 operation. Such a sensitivity is better than the current upper limit on \({\cal B}(\eta \rightarrow e^+ e^-)\) by a factor of 2.3.
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