Study of the B+ to J/psi anti-Lambda p decay in proton-proton collisions at sqrt(s) = 8 TeVстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 28 сентября 2021 г.
Аннотация:A study of the B+→J/\uppsiΛ¯¯¯¯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/\uppsiΛ¯¯¯¯p)/B(B+→J/\uppsiK∗(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/\uppsiΛ¯¯¯¯, J/ψp, and Λ¯¯¯¯p systems produced in the B+→J/\uppsiΛ¯¯¯¯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.