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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classification ✦ hep-ex hep-ph

keywords gammadecayexperimentlimitbranchingcorrespondsdatadetector

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

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