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ISSN - 00213640, EISSN - 10906487, JETP Letters, 2015, vol. 102, 5, p. 266-270

On the search for the η → e + e − decay at the VEPP-2000 e + e − collider

Achasov M. N., Barnyakov A. Yu, Beloborodov K. I., Berdyugin A. V., 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., Koshuba S. V., Kovrizhin D. P., Kupich A. S., Lysenko A. P., Martin K. A., Muchnoi N. Yu, 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.

© 2015, Pleiades Publishing, Inc. The sensitivity of the VEPP-2000 e+e− collider in the search for the rare decay η → e+e− has been studied. The inverse reaction e+e− → η 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− → η in the decay mode η → π0π0π0. In the absence of background, a sensitivity to B(η → e+e−) of 10−6 can be reached during two weeks of VEPP-2000 operation. Such a sensitivity is higher than the current upper limit on B(η → e+e−) by a factor of 2.3.