Study of the�B+?J/??����pB+?J/??�p�decay in proton-proton collisions at�?s�= 8 TeV

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. [Figure not available: see fulltext.] � 2019, The Author(s).

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B physics, Hadron-Hadron scattering (experiments)

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