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New limit on the lepton-flavour violating decay mu -> e gamma

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arxiv 1107.5547 v4 pith:3E4QIU5G submitted 2011-07-27 hep-ex hep-ph

New limit on the lepton-flavour violating decay mu -> e gamma

MEG collaboration: J. Adam , X. Bai , A. M. Baldini , E. Baracchini , C. Bemporad , G. Boca , P. W. Cattaneo , G. Cavoto
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F. Cei C. Cerri A. de Bari M. De Gerone T. Doke S. Dussoni J. Egger K. Fratini Y. Fujii L. Galli G. Gallucci F. Gatti B. Golden M. Grassi D. N. Grigoriev T. Haruyama M. Hildebrandt Y. Hisamatsu F. Ignatov T. Iwamoto P.-R. Kettle B. I. Khazin O. Kiselev A. Korenchenko N. Kravchuk A. Maki S. Mihara W. Molzon T. Mori D. Mzavia H. Natori 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 F. Sergiampietri G. Signorelli S. Suzuki F. Tenchini C. Topchyan Y. Uchiyama R. Valle C. Voena F. Xiao S. Yamada A. Yamamoto S. Yamashita Yu. V. Yudin D. Zanello
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We present a new result based on an analysis of the data collected by the MEG detector at the Paul Scherrer Institut in 2009 and 2010, in search of the lepton flavour violating decay mu->e gamma. The likelihood analysis of the combined data sample, which corresponds to a total of 1.8 x 10**14 muon decays, gives a 90% C.L. upper limit of 2.4 x 10**-12 on the branching ratio of the mu->e gamma decay, constituting the most stringent limit on the existence of this decay to date.

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