Observation of the Λ0b→χc1Λb0→χc1 (3872) pK− decay

Observation of the Λ0b→χc1Λb0→χc1 (3872) pK− decay

Detalles Bibliográficos
Parent link:Journal of High Energy Physics
Vol. 2019, iss. 9.— 2019.— [28, 19 p.]
Autores Corporativos: Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов, Национальный исследовательский Томский политехнический университет Инженерная школа информационных технологий и робототехники Отделение автоматизации и робототехники (ОАР)
Otros Autores: Aaij R. Roel, Beteta C. A. Carlos Abellan, Adeva B. Bernardo, Eydelman S. I. Semen Isaakovich, Kharisova A. E. Anastasiya Evgenjevna, Panshin G. L. Gennady Leonidovich, Strokov S. A. Sergey Aleksandrovich
Sumario:Title screen
Using proton-proton collision data, collected with the LHCb detector and corresponding to 1.0, 2.0 and 1.9 fb−1 of integrated luminosity at the centre-of-mass energies of 7, 8, and 13 TeV, respectively, the decay Λ0b→χc1Λb0→χc1(3872)pK− with χc1(3872) → J/ψ π+π− is observed for the first time. The significance of the observed signal is in excess of seven standard deviations. It is found that (58 ± 15)% of the decays proceed via the two-body intermediate state χc1(3872)Λ(1520). The branching fraction with respect to that of the Λ0bΛb0 → ψ(2S)pK− decay mode, where the ψ(2S) meson is reconstructed in the J/ψ π+π− final state, is measured to be:β(Λ0b→χc1(3872)pK−)/β(Λ0b→ψ(2S)pK−)×β(χc1(3872)→J/ψπ+π−)/β(ψ(2S)→J/ψπ+π−)=(5.4±1.1±0.2)×10−2,β(Λb0→χc1(3872)pK−)β(Λb0→ψ(2S)pK−)×β(χc1(3872)→J/ψπ+π−)β(ψ(2S)→J/ψπ+π−)=(5.4±1.1±0.2)×10−2,where the first uncertainty is statistical and the second is systematic.
Lenguaje:inglés
Publicado: 2019
Materias:
электронный ресурс
труды учёных ТПУ
branching fraction
Hadron-Hadron scattering (experiments)
B physics
Exotics
Acceso en línea:https://doi.org/10.1007/JHEP09(2019)028
Formato: Electrónico Capítulo de libro
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=663413

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