Sirunyan, A. M.Tumasyan, A.Adam, W.Ambrogi, F.Bergauer, T.Brandstetter, J.Dragicevic, M.2025-03-232025-03-2320191029-8479https://doi.org/10.1007/JHEP12(2019)100https://hdl.handle.net/11486/7034A study of the B+-> J/psi = 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+-> J/psi B+-> J/psi K is measured to be (1.054 +/- 0.057(stat) +/- 0.035(syst) +/- 0.011 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/psi, J/psi systems produced in the B+-> J/psi 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 (Lambda) over barp system.eninfo:eu-repo/semantics/closedAccessB physicsHadron-Hadron scattering (experiments)Article1210.1007/JHEP12(2019)1002-s2.0-85076606991Q1WOS:000511707900001Q1