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This article is cited in 4 scientific papers (total in 4 papers)
FIELDS, PARTICLES, AND NUCLEI
On a search for the $\eta \rightarrow e^+ e^-$ decay at the VEPP-2000 $e^+e^-$ collider
M. N. Achasovab, A. Yu. Barnyakovab, K. I. Beloborodovba, A. V. Berdyuginab, A. G. Bogdanchikovb, A. A. Botovb, T. V. Dimovaba, V. P. Druzhininba, V. B. Golubevba, L. V. Kardapoltsevba, A. G. Kharlamovba, I. A. Koopbac, L. A. Korneevba, A. A. Korolba, S. V. Koshubab, D. P. Kovrizhinba, A. S. Kupichb, A. P. Lysenkob, K. A. Martinab, N. Yu. Muchnoiab, A. E. Obrazovskyb, E. V. Pakhtusovab, E. A. Perevedentsevba, Ya. A. Rogovskyab, A. I. Senchenkoab, S. I. Serednyakovba, Z. K. Silagadzeba, Yu. M. Shatunovba, D. A. Shtolb, D. B. Shwartzba, A. N. Skrinskyb, I. K. Surinba, Yu. A. Tikhonovab, Yu. V. Usovab, A. V. Vasiljevab, I. M. Zemlyanskyba a Novosibirsk State University, 630090 Novosibirsk, Russia
b Budker Institute of Nuclear Physics SB of the RAS, 630090 Novosibirsk, Russia
c Novosibirsk State Technical University, 630092 Novosibirsk, Russia
Abstract:
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 $\mathcal{B}(\eta \rightarrow e^+ e^-)$ of $10^{-6}$ can be reached during two weeks of VEPP-2000 operation. Such a sensitivity is better than the current upper limit on $\mathcal{B}(\eta \rightarrow e^+ e^-)$ by a factor of 2.3.
Received: 17.06.2015 Revised: 14.07.2015
Citation:
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, S. V. Koshuba, D. P. Kovrizhin, A. S. Kupich, A. P. Lysenko, K. A. Martin, N. Yu. Muchnoi, A. E. Obrazovsky, E. V. Pakhtusova, E. A. Perevedentsev, Ya. 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, “On a search for the $\eta \rightarrow e^+ e^-$ decay at the VEPP-2000 $e^+e^-$ collider”, Pis'ma v Zh. Èksper. Teoret. Fiz., 102:5 (2015), 297–301; JETP Letters, 102:5 (2015), 266–270
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https://www.mathnet.ru/eng/jetpl4715 https://www.mathnet.ru/eng/jetpl/v102/i5/p297
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