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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2015, vol. 91, 9, p. -

Search for the η′ →e+e- decay with the SND detector

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., Kovrizhin D. P., Koop I. A., Korol A. A., Koshuba S. V., 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.

© 2015 American Physical Society. A search for the process e+e-→η′ 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±0.06MeV with an integrated luminosity of about 2.9pb-1. For reconstruction of the η′ meson, five decay chains have been used: η′→ηπ+π- followed by the η decays to γγ and 3π0 and η′→ηπ0π0 followed by the η decays to π+π-π0, γγ, and 3π0. As a result, the following upper limit has been set on the η′ electronic width: Γη′→e+e-<0.0020eV at the 90% confidence level.