Observation of the decay $B_s^0 \to η_c φ$ and evidence for $B_s^0 \to η_c π^+ π^- $статья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 21 августа 2017 г.
Аннотация:A study of B0s→ηcϕ and B0s→ηcπ+π− decays is performed using pp collision data corresponding to an integrated luminosity of 3.0fb−1, collected with the LHCb detector in Run 1 of the LHC. The observation of the decay B0s→ηcϕ is reported, where the ηc meson is reconstructed in the pp¯, K+K−π+π−, π+π−π+π− and K+K−K+K− decay modes and the ϕ(1020) in the K+K− decay mode. The decay B0s→J/ψϕ is used as a normalisation channel. Evidence is also reported for the decay B0s→ηcπ+π−, where the ηc meson is reconstructed in the pp¯ decay mode, using the decay B0s→J/ψπ+π− as a normalisation channel. The measured branching fractions are
B(B0s→ηcϕ)B(B0s→ηcπ+π−)==(5.01±0.53±0.27±0.63)×10−4,(1.76±0.59±0.12±0.29)×10−4,
where in each case the first uncertainty is statistical, the second systematic and the third uncertainty is due to the limited knowledge of the external branching fractions.