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Chiarello, G. F. Tassielli, G. M. A. Lim, G. Piredda, G. Pizzigoni, G. Rutar, G. Signorelli, H. Nishiguchi, K. Ieki, K. Yoshida, L. Galli, M. Biasotti, M. De Gerone, MEG Collaboration: A. M. Baldini, M. Grassi, M. Hildebrandt, M. Nishimura, M. Panareo, M. Rossella, M. Venturini, N. Khomutov, N. Kravchuk, P. -R. Kettle, P. W. Cattaneo, R. Sawada, S. Dussoni, S. Mihara, S. Nakaura, S. Ogawa, S. Ritt, Tae Im Kang, T. Haruyama, T. Iwamoto, Toshinori Mori, W. Molzon, W. Ootani, Y. Bao, Y. Fujii, Y. Uchiyama, Yu. V. Yudin, Z. Hodge, Z. You","submitted_at":"2013-12-11T15:53:00Z","abstract_excerpt":"We studied the radiative muon decay $\\mu^+ \\to e^+\\nu\\bar{\\nu}\\gamma$ by using for the first time an almost fully polarized muon source. 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De Bari, A. D'Onofrio, A. Graziosi, A. Korenchenko, A. Mtchedlishvili, A. Papa, A. Pepino, A. Popov, A. Yamamoto, B. I. Khazin, C. Bemporad, C. Chiri, C. Voena, D. Kaneko, D. N. Grigoriev, D. Nicol\\`o, E. Baracchini, E. Ripiccini, F. Berg, F. Cei, F. Gatti, F. Grancagnolo, F. Ignatov, F. Renga, F. Sergiampietri, F. Tenchini, G. Boca, G. Cavoto, G. Chiarello, G. F. Tassielli, G. M. A. Lim, G. Piredda, G. Pizzigoni, G. Rutar, G. Signorelli, H. Nishiguchi, K. Ieki, K. Yoshida, L. Galli, M. Biasotti, M. De Gerone, MEG Collaboration: A. M. Baldini, M. Grassi, M. Hildebrandt, M. Nishimura, M. Panareo, M. Rossella, M. Venturini, N. Khomutov, N. Kravchuk, P. -R. Kettle, P. W. Cattaneo, R. Sawada, S. Dussoni, S. Mihara, S. Nakaura, S. Ogawa, S. Ritt, Tae Im Kang, T. Haruyama, T. Iwamoto, Toshinori Mori, W. Molzon, W. Ootani, Y. Bao, Y. Fujii, Y. Uchiyama, Yu. V. Yudin, Z. Hodge, Z. You","submitted_at":"2013-12-11T15:53:00Z","abstract_excerpt":"We studied the radiative muon decay $\\mu^+ \\to e^+\\nu\\bar{\\nu}\\gamma$ by using for the first time an almost fully polarized muon source. We identified a large sample (~13000) of these decays in a total sample of 1.8x10^14 positive muon decays collected in the MEG experiment in the years 2009--2010 and measured the branching ratio B($\\mu^+ \\to e^+\\nu\\bar{\\nu}\\gamma$) = (6.03+-0.14(stat.)+-0.53(sys.))x10^-8 for E_e > 45 MeV and E_{\\gamma} > 40 MeV, consistent with the Standard Model prediction. 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