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Title

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

AuthorsBrochero Cifuentes, J. A. ; Cabrillo, I. J. ; Calderon, Alicia ; Chazin Quero, B.; Duarte Campderros, J. ; Fernández, M. ; Fernández Manteca, P. J.; García Alonso, A.; Gómez, G. ; Martínez-Rivero, Celso ; Martínez Ruiz del Arbol, P. ; Matorras, Francisco ; Piedra, Jonatan ; Prieels, C.; Rodrigo, Teresa ; Ruiz Jimeno, Alberto ; Russo, L.; Scodellaro, Luca ; Trevisani, N. ; Vila, Iván ; Vizán, J.
KeywordsB physics
Hadron-Hadron scattering (experiments)
Issue Date12-Dec-2019
PublisherSpringer
CitationJournal of High Energy Physics 2019: 100 (2019)
AbstractA 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, 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.
Publisher version (URL)http://dx.doi.org/10.1007/JHEP12(2019)100
URIhttp://hdl.handle.net/10261/213865
DOIhttp://dx.doi.org/10.1007/JHEP12(2019)100
Identifiersdoi: 10.1007/JHEP12(2019)100
e-issn: 1029-8479
issn: 1126-6708
Appears in Collections:(IFCA) Artículos
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