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Alkhazov, G; Archilli, F; Baalouch, M; Back, J J; Belyaev, I; Bencivenni, G; Bifani, S; Brambach, T; Brown, H; Coca, C; Cogneras, E; Collins, P; Currie, R; David, P; David, P N Y; De Cian, M; Del Buono, L; Dosil Suárez, A; Färber, C; Ferguson, D; Gandini, P; Gauld, R; Gibson, V; Griffith, P; Hampson, T; Harnew, S T; He, J; Hennessy, K; Hernando Morata, J A; Hombach, C; Hussain, N; Jaeger, A; Jaton, P; Jing, F; John, M; Joram, C; Kaballo, M; Koppenburg, P; Kravchuk, L; Kucharczyk, M; Kvaratskheliya, T; Lai, A; Latham, T; Lees, J-P; Li, Y; Lohn, S; Longstaff, I; Maratas, J; Martellotti, G; Matev, R; Mathe, Z; McCarthy, J; Mordà, A; Müller, K; Nakada, T; Nicol, M; Novoselov, A; Okhrimenko, O; Perret, P; Perrin-Terrin, M; Pesen, E; Pietrzyk, B; Pistone, A; Playfer, S; Polok, G; Puig Navarro, A; Rachwal, B; Rademacker, J H; Rangel, M S; Robbe, P; Roberts, D A; Sagidova, N; Santovetti, E; Schlupp, M; Schneider, O; Schwemmer, R; Shcheglov, Y; Shevchenko, V; Shires, A; Smith, N A; Smith, E; Sparkes, A; Spinella, F; Stoica, S; Storaci, B; Straticiuc, M; Straumann, U; Subbiah, V K; Thomas, E; Tonelli, D; Tresch, M; Tsaregorodtsev, A; Tuning, N; Vagnoni, V; Vecchi, S; Viaud, B; Waldi, R; Wicht, J; Wright, S; Wyllie, K
Physical review letters, 04/2014, Letnik: 112, Številka: 13Journal Article
A search for heavy Majorana neutrinos produced in the B- → π+ μ- μ- decay mode is performed using 3 fb(-1) of integrated luminosity collected with the LHCb detector in pp collisions at center-of-mass energies of 7 and 8 TeV at the LHC. Neutrinos with masses in the range 250 to 5000 MeV and lifetimes from zero to 1000 ps are probed. In the absence of a signal, upper limits are set on the branching fraction B(B- → π+ μ- μ-) as functions of neutrino mass and lifetime. These limits are on the order of 10(-9) for short neutrino lifetimes of 1 ps or less. Limits are also set on the coupling between the muon and a possible fourth-generation neutrino.
