Search for lepton flavour violating muon decay mediated by a new light particle in the MEG experiment

A. M. Baldini, F. Berg, M. Biasotti +68

We present the first direct search for lepton flavour violating muon decay mediated by a new light particle X, ${\mu }^{+}\to {\mathrm{e}}^{+}\mathrm{X},\mathrm{X}\to \gamma \gamma$. This search uses…