arXiv:0908.2594·v2·High Energy Physics — Experiment
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🇮🇹
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.
Comments: 13 pages, 9 figures. v2: improved estimate of photon reconstruction efficiency