Study of the B${}^{+}$ $\to$ J$/\psi \overline{\Lambda }$p decay in proton-proton collisions at $\sqrt{s}=$ 8 TeV

Abstract

A study of the B${}^{+}$ $\to$ J$/\psi \overline{\Lambda }$p decay using proton-proton collision data collected at $\sqrt{s}=$ 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 $\mathcal{B}$(B${}^{+}$ $\to$ J$/\psi \overline{\Lambda }$p ) / $\mathcal{B}$(B${}^{+}$ $\to$ J$/\psi$K${}^{\ast }$(892)${}^{+}$) is measured to be (1.054 $\pm$ 0.057 (stat) $\pm$ 0.035 (syst) $\pm$ 0.011 ($\mathcal{B}$))%, where the last uncertainty reflects the uncertainties in the world-average branching fractions of $\overline{\Lambda }$ and K${}^{\ast }$(892)${}^{+}$ decays to reconstructed final states. The invariant mass distributions of the J$/\psi \overline{\Lambda }$, J$/\psi$p, and $\overline{\Lambda }$p systems produced in the B${}^{+}$ $\to$ J$/\psi \overline{\Lambda }$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 $\overline{\Lambda }$p system.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables, including an additional supplementary figure, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-18-005 (CMS Public Pages)

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• Observation of B${}^0$ $\to$ $\psi$(2S)K${}_{\mathrm{S}}^0{\pi }^{+}{\pi }^{-}$ and B${}_{\mathrm{S}}^0$ $\to$ $\psi$(2S)K${}_{\mathrm{S}}^0$ decays
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