New constraint on the existence of the \mu^+ \rightarrow e^+ \gamma decay
J. Adam et al.
Accepted
The analysis of a combined dataset, totaling $3.6\times 10^{14}$ stopped muons on target, in the search for the lepton flavour violating decay $\megsign$ is presented. The data collected by the MEG experiment at the Paul Scherrer Institut show no excess of events compared to background expectations and yield a new upper limit on the branching ratio of this decay of $5.7\times10^{-13}$ (90\% confidence level). This represents a four times more stringent limit than the previous world best limit set by MEG.