Measurement of the radiative decay of polarized muons in the MEG experiment
- Authors: The MEG Collaboration; Baldini A.M.; Bao Y.; Baracchini E.; Bemporad C.; Berg F.; Biasotti M.; Boca G.; Cattaneo P.W.; Cavoto G.; Cei F.; Chiarello G.; Chiri C.; de Bari A.; 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 T.I.; Kettle P.-R.; Khazin B.I.; Khomutov N.; Korenchenko A.; Kravchuk N.; Lim G.M.A.; Mihara S.; Molzon W.; Mori T.; Mtchedlishvili A.; Nakaura S.; Nicolo 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.V.
- Publication year: 2016
- Type: Articolo in rivista
- OA Link: http://hdl.handle.net/10447/619063
Abstract
We studied the radiative muon decay (Formula presented.) by using for the first time an almost fully polarized muon source. We identified a large sample ((Formula presented.) 13,000) of these decays in a total sample of (Formula presented.) positive muon decays collected in the MEG experiment in the years 2009–2010 and measured the branching ratio (Formula presented.) for (Formula presented.) and (Formula presented.) , 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 (Formula presented.) process.