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  • Observation of photon polar...
    Alkhazov, G; Andrews, J E; Archilli, F; Baalouch, M; Back, J J; Belyaev, I; Bencivenni, G; Bifani, S; Brambach, T; Brown, H; Carboni, G; Cattaneo, M; Clemencic, M; Closier, J; Corti, G; Currie, R; De Capua, S; De Miranda, J M; Deckenhoff, M; Dorigo, M; Dosil Suárez, A; Dupertuis, F; Eidelman, S; Färber, C; Fernandez Albor, V; Ferreira Rodrigues, F; Fiore, M; Forty, R; Fu, J; Gavardi, L; Gersabeck, E; Granado Cardoso, L A; Graugés, E; Graziani, G; Grecu, A; Haen, C; Hafkenscheid, T W; Hamilton, B; Heß, M; Jones, C R; Jost, B; Khanji, B; Kozlinskiy, A; Kreplin, K; Kudryavtsev, V; Lacarrere, D; Lanciotti, E; Leflat, A; Leroy, O; Machikhiliyan, I V; Massafferri, A; McNab, A; Meissner, M; Mordà, A; Muresan, R; Muryn, B; Naik, P; Nicol, M; Nikitin, N; Oblakowska-Mucha, A; Parkes, C; Pavel-Nicorescu, C; Pazos Alvarez, A; Pearce, A; Pesen, E; Petridis, K; Pinci, D; Powell, A; Romanovsky, V; Sail, P; Savrina, D; Senderowska, K; Shapoval, I; Shevchenko, V; Sirendi, M; Smith, N A; Smith, E; Spinella, F; Stagni, F; Stahl, S; Storaci, B; Straumann, U; Teubert, F; Thomas, C; Topp-Joergensen, S; Tournefier, E; Tresch, M; Tuning, N; Ukleja, A; Valenti, G; Vieira, D; Wallace, C; Wandernoth, S; Williams, M; Wimberley, J; Wormser, G; Wu, S; Yang, Z; Zavertyaev, M; Zhang, L

    Physical review letters, 04/2014, Letnik: 112, Številka: 16
    Journal Article

    This Letter presents a study of the flavor-changing neutral current radiative B±→K±π∓π±γ decays performed using data collected in proton-proton collisions with the LHCb detector at 7 and 8 TeV center-of-mass energies. In this sample, corresponding to an integrated luminosity of 3  fb-1, nearly 14 000 signal events are reconstructed and selected, containing all possible intermediate resonances with a K±π∓π± final state in the 1.1,1.9  GeV/c2 mass range. The distribution of the angle of the photon direction with respect to the plane defined by the final-state hadrons in their rest frame is studied in intervals of K±π∓π± mass and the asymmetry between the number of signal events found on each side of the plane is obtained. The first direct observation of the photon polarization in the b→sγ transition is reported with a significance of 5.2σ.