/ hep-ex arXiv:1312.3217


Measurement of polarized muon radiative decay


Adam, J. (Zurich, ETH) ; Bai, X. (Tokyo U., ICEPP) ; Baldini, A.M. (INFN, Pisa) ; Baracchini, E. (UC, Irvine) ; Bemporad, C. (Pisa U.) ; Boca, G. (Pavia U.) ; Cattaneo, P.W. (INFN, Pavia) ; Cavoto, G. (INFN, Rome) ; Cei, F. (Pisa U.) ; Cerri, C. (INFN, Pisa) ; de Bari, A. (Pavia U.) ; De Gerone, M. (INFN, Rome) ; Doke, T. (Waseda U.) ; Dussoni, S. (Pisa U.) ; Egger, J. (PSI, Villigen) ; Fratini, K. (Genoa U.) ; Fujii, Y. (Tokyo U., ICEPP) ; Galli, L. (INFN, Pisa) ; Gallucci, G. (Pisa U.) ; Gatti, F. (Genoa U.) ; Golden, B. (UC, Irvine) ; Grassi, M. (INFN, Pisa) ; Graziosi, A. (INFN, Rome) ; Grigoriev, D.N. (Novosibirsk State U.) ; Haruyama, T. (KEK, Tsukuba) ; Hildebrandt, M. (PSI, Villigen) ; Hisamatsu, Y. (Tokyo U., ICEPP) ; Ignatov, F. (Novosibirsk, IYF) ; Iwamoto, T. (Tokyo U., ICEPP) ; Kaneko, D. (Tokyo U., ICEPP) ; Kettle, P.R. (PSI, Villigen) ; Khazin, B.I. (Novosibirsk State U.) ; Khomotov, N. (Novosibirsk, IYF) ; Kiselev, O. (PSI, Villigen) ; Korenchenko, A. (Dubna, JINR) ; Kravchuk, N. (Dubna, JINR) ; Lim, G. (UC, Irvine) ; Maki, A. (KEK, Tsukuba) ; Mihara, S. (KEK, Tsukuba) ; Molzon, W. (UC, Irvine) ; Mori, T. (Tokyo U., ICEPP) ; Mzavia, D. (Dubna, JINR) ; Nardo, R. (INFN, Pavia) ; Natori, H. (KEK, Tsukuba) ; Nicolo, D. (Pisa U.) ; Nishiguchi, H. (KEK, Tsukuba) ; Nishimura, Y. (Tokyo U., ICEPP) ; Ootani, W. (Tokyo U., ICEPP) ; Panareo, M. (Salento U.) ; Papa, A. (Pisa U.) ; Pazzi, R. (Pisa U.) ; Piredda, G. (INFN, Rome) ; Popov, A. (Novosibirsk, IYF) ; Renga, F. (INFN, Rome) ; Ripiccini, E. (Rome U.) ; Ritt, S. (PSI, Villigen) ; Rossella, M. (INFN, Pavia) ; Sawada, R. (Tokyo U., ICEPP) ; Sergiampietri, F. (INFN, Pisa) ; Signorelli, G. (INFN, Pisa) ; Suzuki, S. (Waseda U.) ; Tenchini, F. (Pisa U.) ; Topchyan, C. (UC, Irvine) ; Uchiyama, Y. (PSI, Villigen) ; Valle, R. (Genoa U.) ; Voena, C. (INFN, Rome) ; Xiao, F. (UC, Irvine) ; Yamada, S. (KEK, Tsukuba) ; Yamamoto, A. (KEK, Tsukuba) ; Yamashita, S. (Tokyo U., ICEPP) ; You, Z. (UC, Irvine) ; Yudin, Yu. V. (Novosibirsk, IYF)

Pages: 8

Abstract: We studied the radiative muon decay $\mu^+ \to e^+\nu\nu\gamma$ by using for the first time an almost fully polarized muon beam. 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 and measured the branching ratio B($\mu^+ \to e^+\nu\nu\gamma$) = (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. Moreover, the precise measurement of this decay mode provides the basic tool for the timing calibration and a strong quality check of the complete MEG experiment in the search for $\mu^+ \to e^+\gamma$ process.

Web-Page: http://inspirehep.net/record/1268809/files/GammaEfficiency.png; http://inspirehep.net/record/1268809/files/MichelFit.png; http://inspirehep.net/record/1268809/files/RMDFit.png; http://inspirehep.net/record/1268809/files/RMDProjectedDistribution.png; http://inspirehep.net/record/1268809/files/RMDTheta.png; http://inspirehep.net/record/1268809/files/RMDTimeFit2009.png; http://inspirehep.net/record/1268809/files/RMDTimeFit2010.png; http://inspirehep.net/record/1268809/files/TRGEfficiencyPhi.png; http://inspirehep.net/record/1268809/files/TRGEfficiencyTheta.png; http://inspirehep.net/record/1268809/files/arXiv:1312.3217.pdf


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