A limit for the mu -> e gamma decay from the MEG experiment
MEG collaboration · 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.
Original · EN
A search for the decay mu -> e gamma, 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(mu -> e gamma) < 2.8 x 10**-11 (90% C.L.). This corresponds to the measurement of positrons and photons from 10**14 stopped mu-decays by means of a superconducting positron spectrometer and a 900 litre liquid xenon photon detector.
English translation
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