Observation of the decay Bs0 → ηcϕ and evidence for Bs0 → ηcπ+π

• Published in: The journal of high energy physics 2017-07, Vol.2017 (7)
• Main Authors: Adinolfi, M., Alkhazov, G., Alves, A. A., d’Argent, P., Artuso, M., Auriemma, G., Baalouch, M., Babuschkin, I., Battista, V., Belyaev, I., Bifani, S., Buytaert, J., Calvi, M., Camboni, A., Ciezarek, G., Cogneras, E., Cojocariu, L., Currie, R., Dall’Occo, E., Davis, A., De Cian, M., De Miranda, J. M., Durante, P., Dzhelyadin, R., Egorychev, V., Eidelman, S., Evans, H. M., Fiorini, M., Fiutowski, T., Gavardi, L., Graciani Diaz, R., Granado Cardoso, L. A., Graziani, G., Griffith, P., Hadavizadeh, T., Hicheur, A., Idzik, M., Jalocha, J., Johnson, D., Joram, C., Jost, B., Kariuki, J. M., Karodia, S., Kecke, M., Kolpin, M., Kozachuk, A., Krzemien, W., Kuonen, A. K., Latham, T., van Leerdam, J., Leflat, A., Lucchesi, D., Lupton, O., Lyu, X., Martin, M., Massafferri, A., McNab, A., Mogini, A., Mountain, R., Müller, D., Nandi, A., Otalora Goicochea, J. M., Otto, A., Palano, A., Palutan, M., Parker, W., Pastore, A., Pellegrino, A., Penso, G., Petruzzo, M., Pietrzyk, B., Pistone, A., Playfer, S., Popov, D., Punzi, G., Qian, W., Rama, M., Rangel, M. S., Ratnikov, F., Renaudin, V., Ricciardi, S., Sanmartin Sedes, B., Schubiger, M., Serra, N., Seyfert, P., Silva de Oliveira, L., Smith, E., Souza De Paula, B., Stevens, H., Storaci, B., Sutcliffe, W., Tisserand, V., Tolk, S., Uwer, U., Vorobyev, A., Whitehead, M., Wilkinson, G., Wishahi, J., Wyllie, K., Zarebski, K. A.
• Format: Article
• Language: English
• Subjects: Classical and Quantum Gravitation; Elementary Particles; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Regular Article - Experimental Physics; Relativity Theory; String Theory
• ISSN: 1029-8479
• DOI: 10.1007/JHEP07(2017)021

A bstract A study of B s 0  →  η c ϕ and B s 0  →  η c π + π − decays is performed using pp collision data corresponding to an integrated luminosity of 3.0 fb −1 , collected with the LHCb detector in Run 1 of the LHC. The observation of the decay B s 0  →  η c ϕ is reported, where the η c meson is reconstructed in the p p ¯ , K + K − π + π − , π + π − π + π − and K + K − K + K − decay modes and the ϕ (1020) in the K + K − decay mode. The decay B s 0  →  J / ψϕ is used as a normalisation channel. Evidence is also reported for the decay B s 0  →  η c π + π − , where the η c meson is reconstructed in the p p ¯ decay mode, using the decay B s 0  →  J / ψπ + π − as a normalisation channel. The measured branching fractions are ℬ B s 0 → η c ϕ = 5.01 ± 0.53 ± 0.27 ± 0.63 × 10 − 4 , ℬ B s 0 → η c π + π − = 1.76 ± 0.59 ± 0.12 ± 0.29 × 10 − 4 , where in each case the first uncertainty is statistical, the second systematic and the third uncertainty is due to the limited knowledge of the external branching fractions.