Abstract
The MEG experiment, phase I, has recently established the best experimental upper limit on the branching ratio of the µ → eγ decay of 4.2 × 10−13 (90% Confidence Level). According to the standard model (SM) of particle physics, such a decay should definitely be non observable while several model of new physics (NP) beyond the SM (BSM) predict it should happen at an experimentally detectable rate. In this talk I summarize the theoretical motivations for searching for this decay and I present the status of the second phase of the experiment, MEG II, which will be able to increase the sensitivity to the µ → eγ decay by about one order of magnitude in few years of data taking.
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