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, 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
TL;DR
This paper reports the first three-month data analysis from the MEG experiment, setting a new upper limit on the mu -> e gamma decay branching ratio at less than 2.8 x 10^-11, using advanced detection techniques.
Contribution
It provides the first experimental upper limit on mu -> e gamma decay from the initial MEG data, improving constraints on lepton flavor violation.
Findings
Upper limit on BR(mu -> e gamma) < 2.8 x 10^-11
Used superconducting positron spectrometer and liquid xenon photon detector
Analyzed ~10^14 stopped mu-decays
Abstract
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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