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A limit for the mu -> e gamma decay from the MEG experiment

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arxiv 0908.2594 v2 pith:GS2GGBB4 submitted 2009-08-18 hep-ex hep-ph

A limit for the mu -> e gamma decay from the MEG experiment

MEG collaboration: J. Adam , X. Bai , A. Baldini , E. Baracchini , A. Barchiesi , C. Bemporad , G. Boca , P. W. Cattaneo
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G. Cavoto G. Cecchet F. Cei C. Cerri A. De Bari M. De Gerone T. Doke S. Dussoni J. Egger L. Galli G. Gallucci F. Gatti B. Golden M. Grassi D. N. Grigoriev T. Haruyama M. Hildebrandt Y. Hisamatsu F. Ignatov T. Iwamoto D. Kaneko P.-R. Kettle B. I. Khazin O. Kiselev A. Korenchenko N. Kravchuk A. Maki S. Mihara W. Molzon T. Mori D. Mzavia H. Natori R. Nard\`o D. Nicol\`o H. Nishiguchi Y. Nishimura W. Ootani M. Panareo A. Papa R. Pazzi G. Piredda A. Popov F. Renga S. Ritt M. Rossella R. Sawada M. Schneebeli F. Sergiampietri G. Signorelli S. Suzuki C. Topchyan V. Tumakov Y. Uchiyama R. Valle C. Voena F. Xiao S. Yamada A. Yamamoto S. Yamashita Yu. V. Yudin D. Zanello
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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.

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