Observation of the decay B0s¯¯¯¯¯¯→χc2K+K− in the ϕ mass regionстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 20 ноября 2020 г.
Аннотация:The B0s¯¯¯¯¯¯→χc2K+K− decay mode is observed and its branching fraction relative to the corresponding χc1 decay mode, in a ±15MeV/c2 window around the ϕ mass, is found to be B(B0s¯¯¯¯¯¯¯→χc2K+K−)B(B0s¯¯¯¯¯¯¯→χc1K+K−)=(17.1±3.1±0.4±0.9)%, where the first uncertainty is statistical, the second systematic and the third due to the knowledge of the branching fractions of radiative χc decays. The decay mode B0s¯¯¯¯¯¯→χc1K+K− allows the B0s mass to be measured as m(B0s)=5366.83±0.25±0.27MeV/c2, where the first uncertainty is statistical and the second systematic. A combination of this result with other LHCb determinations of the B0s mass is made.