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Akar, S.; An, L.; Andreassi, G.; Bay, A.; Benton, J.; Betti, F.; Bifani, S.; Blake, T.; Bondar, A.; Braun, S.; Brodzicka, J.; Calvi, M.; Casse, G.; Chatzikonstantinidis, G.; Closier, J.; Cojocariu, L.; Contu, A.; Costa Sobral, C.M.; Currie, R.; Demmer, M.; Dorigo, M.; Dreimanis, K.; Elsasser, Ch; Farry, S.; Fleuret, F.; Franco Lima, V.; Garsed, P.J.; Gaspar, C.; Gerick, D.; Grillo, L.; Gushchin, E.; Henry, L.; Jacobsson, R.; John, M.; Kelsey, M.; Klaver, S.; Kruse, F.; Lanfranchi, G.; Latham, T.; Lazzeroni, C.; Leflat, A.; Leverington, B.; Longstaff, I.; Lyu, X.; Mancinelli, G.; Manning, P.; Maratas, J.; Meier, F.; Monroy, I.A.; Mussini, M.; Neri, N.; Ogilvy, S.; Palano, A.; Palombo, F.; Pappalardo, L.L.; Parkes, C.; Pearce, A.; Pellegrino, A.; Perazzini, S.; Picatoste Olloqui, E.; Playfer, S.; Polycarpo, E.; Pomery, G.J.; Raniuk, I.; Reichert, S.; dos Reis, A.C.; Ronayne, J.W.; Ruiz Valls, P.; Saborido Silva, J.J.; Saitta, B.; Sanchez Mayordomo, C.; Santacesaria, R.; Santimaria, M.; Sarti, A.; Schindler, H.; Schmelzer, T.; Schopper, A.; Semennikov, A.; Sergi, A.; Shapkin, M.; Shekhtman, L.; Siddi, B.G.; Sirendi, M.; Sokoloff, M.D.; Stenyakin, O.; Sutcliffe, W.; Tayduganov, A.; van Tilburg, J.; Vacca, C.; Vecchi, S.; Veneziano, G.; Venkateswaran, A.; Voß, C.; de Vries, J.A.; Vázquez Sierra, C.; Wang, J.; Wicht, J.; Wishahi, J.; Wislicki, W.; Yuan, X.
Physics letters. B, 06/2017, Letnik: 769, Številka: CJournal Article
The first observation of the decay ηc(2S)→pp¯ is reported using proton–proton collision data corresponding to an integrated luminosity of 3.0 fb−1 recorded by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The ηc(2S) resonance is produced in the decay B+→cc¯K+. The product of branching fractions normalised to that for the J/ψ intermediate state, Rηc(2S), is measured to beRηc(2S)≡B(B+→ηc(2S)K+)×B(ηc(2S)→pp¯)B(B+→J/ψK+)×B(J/ψ→pp¯)=(1.58±0.33±0.09)×10−2, where the first uncertainty is statistical and the second systematic. No signals for the decays B+→X(3872)(→pp¯)K+ and B+→ψ(3770)(→pp¯)K+ are seen, and the 95% confidence level upper limits on their relative branching ratios are found to be RX(3872)<0.25×10−2 and Rψ(3770)<0.10. In addition, the mass differences between the ηc(1S) and the J/ψ states, between the ηc(2S) and the ψ(2S) states, and the natural width of the ηc(1S) are measured asMJ/ψ−Mηc(1S)=110.2±0.5±0.9 MeV,Mψ(2S)−Mηc(2S)=52.5±1.7±0.6 MeV,Γηc(1S)=34.0±1.9±1.3 MeV.
