Data di Pubblicazione:
2016
Abstract:
We studied the radiative muon decay mu(+) -> e(+) nu(nu) over bar gamma by using for the first time an almost fully polarized muon source. We identified a large sample (similar to 13,000) of these decays in a total sample of 1.8 x 10(14) positive muon decays collected in the MEG experiment in the years 2009-2010 and measured the branching ratio B(mu -> e nu(nu) over bar gamma) = (6.03 +/- 0.14(stat.) +/- 0.53(sys.)) x 10(-8) for E-e > 45 MeV and E-gamma > 40 MeV, consistent with the Standard Model prediction. The precise measurement of this decay mode provides a basic tool for the timing calibration, a normalization channel, and a strong quality check of the complete MEG experiment in the search for mu(+) -> e(+)gamma process.
Tipologia CRIS:
1.1 Articolo in rivista
Keywords:
Engineering, Physics, Astronomy
Elenco autori:
Baldini, A. M.; Bao, Y.; Baracchini, E.; Bemporad, C.; Berg, F.; Biasotti, M.; Boca, Gianluigi; Cattaneo, P. W.; Cavoto, G.; Cei, F.; Chiarello, G.; Chiri, C.; DE BARI, Antonio; De Gerone, M.; D’Onofrio, A.; Dussoni, S.; Fujii, Y.; Galli, L.; Gatti, F.; Grancagnolo, F.; Grassi, M.; Graziosi, A.; Grigoriev, D. N.; Haruyama, T.; Hildebrandt, M.; Hodge, Z.; Ieki, K.; Ignatov, F.; Iwamoto, T.; Kaneko, D.; Kang, Tae Im; Kettle, P. R.; Khazin, B. I.; Khomutov, N.; Korenchenko, A.; Kravchuk, N.; Lim, G. M. A.; Mihara, S.; Molzon, W.; Mori, Toshinori; Mtchedlishvili, A.; Nakaura, S.; Nicolò, D.; Nishiguchi, H.; Nishimura, M.; Ogawa, S.; Ootani, W.; Panareo, M.; Papa, A.; Pepino, A.; Piredda, G.; Pizzigoni, G.; Popov, A.; Renga, F.; Ripiccini, E.; Ritt, S.; Rossella, M.; Rutar, G.; Sawada, R.; Sergiampietri, F.; Signorelli, G.; Tassielli, G. F.; Tenchini, F.; Uchiyama, Y; Venturini, M.; Voena, C.; Yamamoto, A.; Yoshida, K.; You, Z.; Yudin, Y. u. V.
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