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Polikarpov, S. M.; Belyaev, I. M.; Egorychev, V. J.; Savrina, D. V.
Physics of atomic nuclei, 2016/3, Letnik: 79, Številka: 2Journal Article
The first ever observation of the decay process B 0 → J /ψη′ is described. The branching ratios were measured for the decay processes B (s) → J/ψη(′), and the η–η′ mixing angles were determined on this basis. The first indication of the occurrence of the decay process B s → ψ(2 S )η′ is presented. The respective analysis was performed on the basis of data accumulated with the LHCb detector in proton–proton collisions at the c.m. collision energies of 7 and 8 TeV and the integrated luminosity of 3 fb −1 .
