Search for the Lepton Flavour Violating Decay ${\mu }^{+}\to e^{+}\gamma$ with the Full Dataset of the MEG Experiment

Abstract

The final results of the search for the lepton flavour violating decay ${\mu }^{+}\to {\mathrm{e}}^{+}\gamma$ based on the full dataset collected by the MEG experiment at the Paul Scherrer Institut in the period 2009--2013 and totalling $7.5\times 10^{14}$ stopped muons on target are presented. No significant excess of events is observed in the dataset with respect to the expected background and a new upper limit on the branching ratio of this decay of $BR({\mu }^{+}\to {\mathrm{e}}^{+}\gamma )<4.2\times 10^{-13}$ (90\%\ confidence level) is established, which represents the most stringent limit on the existence of this decay to date.

30 pages, 31 figures

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