Study of the B+→ J / ψ Λ ¯ p decay in proton-proton collisions at √s = 8 TeV
Abstract
A study of the B+→J/ψΛ¯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/ψΛ¯p)/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 Λand K*(892) + decays to reconstructed final states. The invariant mass distributions of the J/ψΛ¯, J/ψp, and Λ¯p systems produced in the B+→J/ψΛ¯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. Mehr anzeigen
Persistenter Link
https://doi.org/10.3929/ethz-b-000387176Publikationsstatus
publishedExterne Links
Zeitschrift / Serie
Journal of High Energy PhysicsBand
Seiten / Artikelnummer
Verlag
SpringerThema
B physics; Hadron-Hadron scattering (experiments)Organisationseinheit
03593 - Dissertori, Günther / Dissertori, Günther
03904 - Wallny, Rainer / Wallny, Rainer
08803 - Grab, Christoph (Tit.Prof.)
09631 - Shchutska, Lesya (ehemalig) / Shchutska, Lesya (former)