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27 April 2024

» arxiv » 1507.2073

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On a search for the $eta ightarrow e^+ e^-$ decay at the VEPP-2000 $e^+e^-$ collider
M. N. Achasov ; A. Yu. Barnyakov ; K. I. Beloborodov A. V. Berdyugin ; A. G. Bogdanchikov ; A. A. Botov ; T. V. Dimova ; V. P. Druzhinin ; V. B. Golubev ; L. V. Kardapoltsev ; A. G. Kharlamov ; I. A. Koop ; L. A. Korneev ; A. A. Korol ; D. P. Kovrizhin ; A. S. Kupich ; A. P. Lysenko ; K. A. Martin ; N. Yu. Muchnoi ; A. E. Obrazovsky ; E. V. Pakhtusova ; E. A. Perevedentsev ; Yu. A. Rogovsky ; A. I. Senchenko ; S. I. Serednyakov ; Z. K. Silagadze ; Yu. M. Shatunov ; D. A. Shtol ; D. B. Shwartz ; A. N. Skrinsky ; I. K. Surin ; Yu. A. Tikhonov ; Yu. V. Usov ; A. V. Vasiljev ; I. M. Zemlyansky ;
Date:	8 Jul 2015
Abstract:	A sensitivity of the VEPP-2000 $e^+e^-$ collider in a search for the rare decay $eta ightarrow e^+ e^-$ has been studied. The inverse reaction $e^+ e^- ightarrow eta$ 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 $e^+ e^- ightarrow eta$ in the decay mode $eta opi^0pi^0pi^0$. In the absence of background, a sensitivity to ${cal B}(eta ightarrow e^+ e^-)$ of $10^{-6}$ can be reached during two weeks of VEPP-2000 operation. Such a sensitivity is better than the current upper limit on ${cal B}(eta ightarrow e^+ e^-)$ by a factor of 2.3.
Source:	arXiv, 1507.2073
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