Observation of ηc(2S)→pp¯ and search for X(3872)→pp¯ decays

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 branc...

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Veröffentlicht in:	Physics letters. B 2017-06, Vol.769 (C), p.305-313
Hauptverfasser:	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.
Format:	Artikel
Sprache:	eng
Schlagworte:	High Energy Physics - Experiment Physics
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Zusammenfassung:	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)
ISSN:	0370-2693 1873-2445
DOI:	10.1016/j.physletb.2017.03.046