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

• Published in: The journal of high energy physics Vol. 12
• Main Authors: Sirunyan, Albert M, Tumasyan, Armen, Adam, Wolfgang, Ambrogi, Federico, Bergauer, Thomas, Brandstetter, Johannes, Dragicevic, Marko, Erö, Janos, Escalante del Valle, Alberto, Flechl, Martin, Fruehwirth, Rudolf, Jeitler, Manfred, Krammer, Natascha, Krätschmer, Ilse, Liko, Dietrich, Madlener, Thomas, Mikulec, Ivan, Rad, Navid, Schieck, Jochen, Schöfbeck, Robert, Spanring, Markus, Spitzbart, Daniel, Waltenberger, Wolfgang, Wulz, Claudia-Elisabeth, Zarucki, Mateusz, Drugakov, Vladimir, Mossolov, Vladimir, Suarez Gonzalez, Juan, Darwish, Mohamed Rashad, de Wolf, Eddi A, Di Croce, Davide, Janssen, Xavier, Lauwers, Jasper, Lelek, Aleksandra, Pieters, Maxim, Rejeb Sfar, Haifa, van Haevermaet, Hans, van Mechelen, Pierre, van Putte, Senne, van Remortel, Nick, Blekman, Freya, Bols, Emil Sørensen, Chhibra, Simranjit Singh, d'Hondt, Jorgen, de Clercq, Jarne, Lontkovskyi, Denys, Lowette, Steven, Marchesini, Ivan, Moortgat, Seth, Moreels, Lieselotte, Python, Quentin, Skovpen, Kirill, Tavernier, Stefaan, van Doninck, Walter, van Mulders, Petra, van Parijs, Isis, Beghin, Diego, Bilin, Bugra, Brun, Hugues, Clerbaux, Barbara, de Lentdecker, Gilles, Delannoy, Hugo, Dorney, Brian, Favart, Laurent, Grebenyuk, Anastasia, Kalsi, Amandeep Kaur, Luetic, Jelena, Popov, Andrey, Postiau, Nicolas, Starling, Elizabeth, Thomas, Laurent, Vander Velde, Catherine, Vanlaer, Pascal, Vannerom, David, Cornelis, Tom, Dobur, Didar, Khvastunov, Illia, Niedziela, Marek, Roskas, Christos, Trocino, Daniele, Tytgat, Michael, Verbeke, Willem, Vermassen, Basile, Vit, Martina, Zaganidis, Nicolas, Bondu, Olivier, Bruno, Giacomo, Caputo, Claudio, David, Pieter, Delaere, Christophe, Delcourt, Martin, Giammanco, Andrea, Lemaitre, Vincent, Magitteri, Alessio, Prisciandaro, Jessica, Saggio, Alessia, Vidal Marono, Miguel, Vischia, Pietro, Zobec, Joze, Alves, Fábio Lúcio
• Format: Journal Article
• Language: English
• Published: Springer 2019
• Subjects: High Energy Physics - Experiment; Physics; B+: hadronic decay; experimental results; mass spectrum: (J/psi Antilambda); Hadron-Hadron scattering (experiments); mass spectrum: (Antilambda p); branching ratio: ratio: measured; CMS; amplitude analysis; CERN LHC Coll; 8000 GeV-cms; B physics; B+: branching ratio; S041:Desig=318; phase space; p p: colliding beams; p p: scattering; mass spectrum: (J/psi p); B+ > > J/psi Antilambda p
• ISSN: 1126-6708; 1029-8479
• DOI: 10.1007/JHEP12(2019)100

A study of the $ {\mathrm{B}}^{+}\to \mathrm{J}/\psi \overline{\Lambda}\mathrm{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}\left({\mathrm{B}}^{+}\to \mathrm{J}/\psi \overline{\Lambda}\mathrm{p}\right)/\mathcal{B}\left({\mathrm{B}}^{+}\to \mathrm{J}/{\psi \mathrm{K}}^{\ast }{(892)}^{+}\right) $ is measured to be (1.054 ± 0.057(stat) ± 0.035(syst) ± 0.011($ \mathcal{B} $))%, where the last uncertainty reflects the uncertainties in the world-average branching fractions of $ \overline{\Lambda} $ and K$^{*}$(892)$^{+}$ decays to reconstructed final states. The invariant mass distributions of the $ \mathrm{J}/\psi \overline{\Lambda} $, J/ψp, and $ \overline{\Lambda}\mathrm{p} $ systems produced in the $ {\mathrm{B}}^{+}\to \mathrm{J}/\psi \overline{\varLambda}\mathrm{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}\mathrm{p} $ system.