Abstract: A study of the B+?J/??¯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/??¯p)/B(B+?J/?K?(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 ?¯ and K*(892) + decays to reconstructed final states. The invariant mass distributions of the J/??¯, J/?p, and ?¯p systems produced in the B+?J/??¯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 ?¯p system.

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