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Natori, H. Nishiguchi, J. Egger, L. Galli, M. De Gerone, MEG collaboration: J. Adam, M. Grassi, M. Hildebrandt, M. Panareo, M. Rossella, M. Schneebeli, N. Kravchuk, O. Kiselev, P.-R. Kettle, P. W. Cattaneo, R. Nard\\`o, R. Pazzi, R. Sawada, R. Valle, S. Dussoni, S. Mihara, S. Ritt, S. Suzuki, S. Yamada, S. Yamashita, T. Doke, T. Haruyama, T. Iwamoto, T. Mori, V. Tumakov, W. Molzon, W. Ootani, X. Bai, Y. Hisamatsu, Y. Nishimura, Y. Uchiyama, Yu. V. Yudin","submitted_at":"2009-08-18T15:34:23Z","abstract_excerpt":"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.). 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