First observation of the decay Λ0b→ηc(1S)pK−
| Источник: | Physical Review D: particles, fields, gravitation, and cosmology Vol. 102, iss. 11.— 2020.— [112012, 12 p.] |
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| Корпоративные авторы: | , |
| Другие авторы: | , , , , , , |
| Примечания: | Title screen The decay Λ0b→ηc(1S)pK− is observed for the first time using a data sample of proton-proton collisions, corresponding to an integrated luminosity of 5.5 fb−1, collected with the LHCb experiment at a center-of-mass energy of 13 TeV. The branching fraction of the decay is measured, using the Λ0b→J/ψpK− decay as a normalization mode, to be B(Λ0b→ηc(1S)pK−)=(1.06±0.16±0.06+0.22−0.19)×10−4, where the quoted uncertainties are statistical, systematic and due to external inputs, respectively. A study of the ηc(1S)p mass spectrum is performed to search for the Pc(4312)+ pentaquark state. No evidence is observed and an upper limit of B(Λ0b→Pc(4312)+K−)×B(Pc(4312)+→ηc(1S)p)B(Λ0b→ηc(1S)pK−)<0.24 is obtained at the 95% confidence level. |
| Опубликовано: |
2020
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| Предметы: | |
| Online-ссылка: | https://doi.org/10.1103/PhysRevD.102.112012 |
| Формат: | Электронный ресурс Статья |
| Запись в KOHA: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=664680 |