RUTAR , G.

We studied the radiative muon decay (Formula presented.) by using for the first time an almost fully polarized muon source. We identified a large sample ((Formula presented.) 13,000) of these decays in a total sample of (Formula presented.) positive muon decays collected in the MEG experiment in the years 2009–2010 and measured the branching...

The MEG experiment makes use of one of the world's most intense low energy muon beams, in order to search for the lepton flavour violating process μ+ → e+ γ. We determined the residual beam polarization at the thin stopping target, by measuring the asymmetry of the angular distribution of Michel decay positrons as a function of energy. The...

The MEG experiment, designed to search for the μ+→ e+γ decay, completed data-taking in 2013 reaching a sensitivity level of 5.3 × 10- 13for the branching ratio. In order to increase the sensitivity reach of the experiment by an order of magnitude to the level of 6 × 10- 14, a total upgrade, involving substantial changes to the experiment, has...

The final results of the search for the lepton flavour violating decay μ+â†' e+γ based on the full dataset collected by the MEG experiment at the Paul Scherrer Institut in the period 2009–2013 and totalling 7.5 × 1014stopped muons on target are presented. No significant excess of events is observed in the dataset with respect to the expected...