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Adeva, B; Amhis, Y; Andreassi, G; Audurier, B; Balagura, V; Bedeschi, F; Belous, K; Bencivenni, G; Bertholet, E; Betancourt, C; Bhasin, S; Birnkraut, A; Cadeddu, S; Calvi, M; Campora Perez, D H; Carboni, G; Cattaneo, M; Chefdeville, M; Dall'Occo, E; d'Argent, P; Del Buono, L; Delaney, B; Di Nezza, P; Didenko, S; Dosil Suárez, A; Dzyuba, A; Eklund, L; Evans, T; Farry, S; Fitzpatrick, C; Fontanelli, F; Forty, R; Frei, C; Gallas Torreira, A; Gandini, P; Garcia Martin, L M; Garra Tico, J; Gazzoni, G; Ghez, Ph; Gibson, V; Granado Cardoso, L A; Graverini, E; Gruberg Cazon, B R; Hancock, T H; Harnew, N; Hill, D; Ibis, P; Keizer, F; Kopecna, R; Kress, F; Kvaratskheliya, T; Leverington, B; Li, Z; Loi, A; Lovell, G H; Lupton, O; Mackowiak, P; Maltsev, T; Marangotto, D; Marino, P; Melnychuk, D; Merk, M; Morandin, M; Mukherjee, M; Müller, V; Nandakumar, R; Nguyen, T D; Ogilvy, S; Ossowska, A; Piucci, A; Polci, F; Poliakova, M; Quintana, B; Rama, M; Renaudin, V; Robbe, P; Rodriguez Lopez, J A; Satriano, C; Schwemmer, R; Semennikov, A; Shekhtman, L; Stagni, F; Stahl, M; Stenyakin, O; Stramaglia, M E; Szabelski, A; Tuci, G; Vagnoni, V; Vazquez Gomez, R; Vernet, M; Veronesi, M; Vieites Diaz, M; Vitti, M; Vom Bruch, D; Watson, N K; Websdale, D; Xing, H; Yin, H; Yu, J; Zavertyaev, M
Physical review letters, 2019-Jul-19, 20190719, Letnik: 123, Številka: 3Journal Article
The radiative decay Λ_{b}^{0}→Λγ is observed for the first time using a data sample of proton-proton collisions corresponding to an integrated luminosity of 1.7 fb^{-1} collected by the LHCb experiment at a center-of-mass energy of 13 TeV. Its branching fraction is measured exploiting the B^{0}→K^{*0}γ decay as a normalization mode and is found to be B(Λ_{b}^{0}→Λγ)=(7.1±1.5±0.6±0.7)×10^{-6}, where the quoted uncertainties are statistical, systematic, and systematic from external inputs, respectively. This is the first observation of a radiative decay of a beauty baryon.
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