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  • Observation of a peaking st...
    Chatrchyan, S.; Waltenberger, W.; Roland, B.; Van Onsem, G.P.; Clerbaux, B.; Gay, A.P.R.; Castello, R.; Lemaitre, V.; Vutova, M.; Kozhuharov, V.; Chen, G.M.; Sanabria, J.C.; Lelas, D.; Hamel de Monchenault, G.; Brom, J.-M.; Chierici, R.; Calpas, B.; Flügge, G.; Kargoll, B.; Lange, W.; Riedl, C.; Schleper, P.; Seidel, M.; Thomsen, J.; Dierlamm, A.; Hartmann, F.; Gupta, R.; Etesami, S.M.; Maggi, M.; Selvaggi, G.; Cavallo, F.R.; Di Matteo, L.; Margoni, M.; Montecassiano, F.; Pazzini, J.; Gabusi, M.; Ratti, S.P.; Riccardi, C.; Menichelli, M.; Giassi, A.; Kraan, A.; Cossutti, F.; Park, H.; Hong, B.; Kim, J.H.; Choi, Y.; Shah, M.A.; Krychkine, V.; Volkov, A.; Alcaraz Maestre, J.; Gomez, G.; Lopez Virto, A.; Scodellaro, L.; Auffray, E.; Ball, A.H.; Magini, N.; Meschi, E.; Pierini, M.; Piparo, D.; Rovere, M.; Casal, B.; Nessi-Tedaldi, F.; Otiougova, P.; Yu, S.S.; Hou, W.-S.; Serin, M.; Ozkorucuklu, S.; Clement, E.; Poll, A.; Iles, G.; Virdee, T.; Speer, T.; Smith, J.; Hanson, G.; Wilken, R.; Campagnari, C.; Rossin, R.; Gaz, A.; Smith, J.G.; Mirman, N.; Teo, W.D.; Spalding, W.J.; Furic, I.K.; Chen, J.; Newsom, C.R.; Tiras, E.; Blumenfeld, B.; Fehling, D.; Maravin, Y.; Pozdnyakov, A.; Lynch, S.; Berry, E.; Jindal, P.; Lujan, P.; Stickland, D.; Lungu, G.; Yang, Z.C.; Montalvo, R.; Perloff, A.; Kovitanggoon, K.

    Physics letters. B, 06/2014, Letnik: 734
    Journal Article

    A peaking structure in the J/ψϕ mass spectrum near threshold is observed in B±→J/ψϕK± decays, produced in pp collisions at s=7 TeV collected with the CMS detector at the LHC. The data sample, selected on the basis of the dimuon decay mode of the J/ψ, corresponds to an integrated luminosity of 5.2 fb−1. Fitting the structure to an S-wave relativistic Breit–Wigner lineshape above a three-body phase-space nonresonant component gives a signal statistical significance exceeding five standard deviations. The fitted mass and width values are m=4148.0±2.4(stat.)±6.3(syst.)MeV and Γ=28−11+15(stat.)±19(syst.)MeV, respectively. Evidence for an additional peaking structure at higher J/ψϕ mass is also reported.