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

Abstract

A study of the B⁺→J/ψΛ̅p 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/ψΛ̅p)/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 Λ̅ and K*(892)⁺ decays to reconstructed final states. The invariant mass distributions of the J/ψΛ̅, J/ψp, and Λ̅p systems produced in the B+→J/ψΛ̅p 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 Λ̅p system

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