Abstract
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(2S)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.
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Original Russian Text © S.M. Polikarpov, I.M. Belyaev, V.J. Egorychev, D.V. Savrina, 2016, published in Yadernaya Fizika, 2016, Vol. 79, No. 2, pp. 177–181.
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Polikarpov, S.M., Belyaev, I.M., Egorychev, V.J. et al. Study of η–η′ mixing in B-meson decay with the LHCb detector. Phys. Atom. Nuclei 79, 288–291 (2016). https://doi.org/10.1134/S1063778816020149
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DOI: https://doi.org/10.1134/S1063778816020149