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Study of the B +→ J / ψ Λ ¯ p decay in proton-proton collisions at √s = 8 TeV

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2019
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Authors
Sirunyan, A.
Tumasyan, A.
Adam, W.
Ambrogi, F.
Bergauer, T.
Adžić, Petar
Ćirković, Predrag
Devetak, Damir
Đorđević, Miloš
Milenović, Predrag
Milošević, Jovan
Stojanović, Milan
Contributors
CMS Collaboration
CMS Collaboration (ukupan broj autora: 2337)
Article (Published version)
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© 2019, The Author(s)
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Abstract
A study of the B +→ J / ψ Λ ¯ p decay using proton-proton collision data collected at s = 8 TeV by the CMS experiment at the LHC, corresponding to an integrated luminosity of 19.6 fb−1, is presented. The ratio of branching fractions B(B+→J/ψΛ¯p)/B(B+→J/ψK∗(892)+) is measured to be (1.054 ± 0.057(stat) ± 0.035(syst) ± 0.011(B))%, where the last uncertainty reflects the uncertainties in the world-average branching fractions of Λ ¯ and K*(892) + decays to reconstructed final states. The invariant mass distributions of the J / ψ Λ ¯ , J/ψp, and Λ ¯ p systems produced in the B +→ J / ψ Λ¯ p decay are investigated and found to be inconsistent with the pure phase space hypothesis. The analysis is extended by using a model-independent angular amplitude analysis, which shows that the observed invariant mass distributions are consistent with the contributions from excited kaons decaying to the Λ ¯ p system.
Source:
Journal of High Energy Physics, 2019, 2019, 12, 1-38

DOI: 10.1007/JHEP12(2019)100

ISSN: 1126-6708

WoS: 000511707900001

Scopus: 2-s2.0-85076606991
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http://vinar.vin.bg.ac.rs/handle/123456789/8765
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