Search for the $\eta^{\prime}\to e^+e^-$ decay with the SND detector
| Autor: | Achasov, M. N., Aulchenko, V. M., Barnyakov, A. Yu., 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., Muchnoi, N. Yu., Obrazovsky, A. E., Otboev, A. V., Pakhtusova, E. V., Senchenko, A. I., Serednyakov, S. I., Shatunov, P. Yu., 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. |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Phys. Rev. D 91, 092010 (2015) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.91.092010 |
| Popis: | 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. Comment: 12 pages, 6 figures |
| Databáze: | arXiv |
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