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Ali, S; Andreotti, M; Back, J J; Barter, W; Bel, L J; Belyaev, I; Betti, F; Bezshyiko, Ia; Bjørn, M; Buytaert, J; Calabrese, R; Carniti, P; Chamont, D; Chobanova, V; Ciambrone, P; Cid Vidal, X; Closier, J; Cogneras, E; Da Silva, C L; Dall'Occo, E; De Capua, S; De Miranda, J M; De Paula, L; Del Buono, L; Durham, J M; Farley, N; Fernandez Declara, P; Ferreira Lopes, L; Ferro-Luzzi, M; Fini, R A; Fleuret, F; Fontana, M; Fu, J; Gallas Torreira, A; Gambetta, S; Gandini, P; García Pardiñas, J; Gaspar, C; Gianì, S; Griffith, P; Hancock, T H; van Herwijnen, E; Huang, W; Kecke, M; Klaver, S; Klimkovich, T; Lefrançois, J; Leroy, O; Lindner, R; Luppi, E; Lupton, O; Maciuc, F; Macko, V; Mackowiak, P; Majewski, M W; Martinez Vidal, F; Mathe, Z; Maurice, E; Maurin, B; McNab, A; Meadows, B; Meaux, C; Michielin, E; Mombächer, T; Monteil, S; Moron, J; Müller, J; Ogilvy, S; Owen, P; Parker, W; Pellegrino, A; Penso, G; Poslavskii, S; Potterat, C; Price, E; Puig Navarro, A; Punzi, G; Romanovskiy, V; Sarti, A; Schellenberg, M; Schindler, H; Schmelzer, T; Schneider, O; Sciascia, B; Serra, N; Shears, T; Straumann, U; Syropoulos, V; Tuning, N; Ustyuzhanin, A; Vagner, A; Valassi, A; Valenti, G; Viana Barbosa, J V; Volkov, V; Vorobyev, V; de Vries, J A; Wark, H M; Whitehead, M; Wimberley, J
Physical review letters, 2018-Jun-01, Letnik: 120, Številka: 22Journal Article
A search for the rare decay Σ^{+}→pμ^{+}μ^{-} is performed using pp collision data recorded by the LHCb experiment at center-of-mass energies sqrts=7 and 8 TeV, corresponding to an integrated luminosity of 3 fb^{-1}. An excess of events is observed with respect to the background expectation, with a signal significance of 4.1 standard deviations. No significant structure is observed in the dimuon invariant mass distribution, in contrast with a previous result from the HyperCP experiment. The measured Σ^{+}→pμ^{+}μ^{-} branching fraction is (2.2_{-1.3}^{+1.8})×10^{-8}, where statistical and systematic uncertainties are included, which is consistent with the standard model prediction.
