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Adam, J.; Bai, X.; Baldini, A.; Baracchini, E.; Barchiesi, A.; Bemporad, C.; Boca, G.; Cattaneo, P.W.; Cavoto, G.; Cecchet, G.; Cei, F.; Cerri, C.; De Bari, A.; De Gerone, M.; Doke, T.; Dussoni, S.; Egger, J.; Galli, L.; Gallucci, G.; Gatti, F.; Golden, B.; Grassi, M.; Grigoriev, D.N.; Haruyama, T.; Hildebrandt, M.; Hisamatsu, Y.; Ignatov, F.; Iwamoto, T.; Kaneko, D.; Kettle, P.-R.; Khazin, B.I.; Kiselev, O.; Korenchenko, A.; Kravchuk, N.; Maki, A.; Mihara, S.; Molzon, W.; Mori, T.; Mzavia, D.; Natori, H.; Nardò, R.; Nicolò, D.; Nishiguchi, H.; Nishimura, Y.; Ootani, W.; Panareo, M.; Papa, A.; Pazzi, R.; Piredda, G.; Popov, A.; Renga, F.; Ritt, S.; Rossella, M.; Sawada, R.; Schneebeli, M.; Sergiampietri, F.; Signorelli, G.; Suzuki, S.; Topchyan, C.; Tumakov, V.; Uchiyama, Y.; Valle, R.; Voena, C.; Xiao, F.; Yamada, S.; Yamamoto, A.; Yamashita, S.; Yudin, Yu.V.; Zanello, D.
Nuclear physics. B, 07/2010, Volume: 834, Issue: 1Journal Article
A search for the decay μ + → e + γ , performed at PSI and based on data from the initial three months of operation of the MEG experiment, yields an upper limit on the branching ratio of BR ( μ + → e + γ ) ⩽ 2.8 × 10 − 11 (90% C.L.). This corresponds to the measurement of positrons and photons from ∼ 10 14 stopped μ + -decays by means of a superconducting positron spectrometer and a 900 litre liquid xenon photon detector.
