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Study of the B⁻ -> Łambda_c⁺ \barŁambda_c⁻ K⁻ decayстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Бережной А.В., Горелов И.В., Данилина А.В., Козачук А.Д., Лефлат А.К., Никитин Н.В., Саврина Д.В., Соломин А.Н., Волков В.Ю., Жуков В.Ю., Королев М.Г., LHCb Collaboration
- Журнал: Physical Review D
- Том: 108
- Год издания: 2023
- Издательство: American Physical Society
- Местоположение издательства: United States
- Первая страница: 012020
- DOI: 10.1103/PhysRevD.108.012020
- Аннотация: The decay B−→Λ+cΛ¯−cK− is studied in proton-proton collisions at a center-of-mass energy of s√=13 TeV using data corresponding to an integrated luminosity of 5 fb−1 collected by the LHCb experiment. In the Λ+cK− system, the Ξc(2930)0 state observed at the BaBar and Belle experiments is resolved into two narrower states, Ξc(2923)0 and Ξc(2939)0, whose masses and widths are measured to bem(Ξc(2923)0)=2924.5±0.4±1.1MeV,m(Ξc(2939)0)=2938.5±0.9±2.3MeV,Γ(Ξc(2923)0)=4.8±0.9±1.5MeV,Γ(Ξc(2939)0)=11.0±1.9±7.5MeV,where the first uncertainties are statistical and the second systematic. The results are consistent with a previous LHCb measurement using a prompt Λ+cK− sample. Evidence of a new Ξc(2880)0 state is found with a local significance of 3.8σ, whose mass and width are measured to be 2881.8±3.1±8.5MeV and 12.4±5.3±5.8MeV, respectively. In addition, evidence of a new decay mode Ξc(2790)0→Λ+cK− is found with a significance of 3.7σ. The relative branching fraction of B−→Λ+cΛ¯−cK− with respect to the B−→D+D−K− decay is measured to be 2.36±0.11±0.22±0.25, where the first uncertainty is statistical, the second systematic and the third originates from the branching fractions of charm hadron decays.
- Добавил в систему: Бережной Александр Викторович