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
© 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.