Search for lepton flavour violating muon decay mediated by a new light particle in the MEG experiment
2020
We present the first direct search for lepton flavour violating muon decay mediated by a new light particle X,
$$\upmu ^+ \rightarrow \mathrm {e}^+\mathrm {X}, \mathrm {X} \rightarrow \upgamma \upgamma \ $$
. This search uses a dataset resulting from
$$7.5\times 10^{14}$$
stopped muons collected by the MEG experiment at the Paul Scherrer Institut in the period 2009–2013. No significant excess is found in the mass region 20–45 MeV/c
$$^2$$
for lifetimes below 40 ps, and we set the most stringent branching ratio upper limits in the mass region of 20–40 MeV/c
$$^2$$
, down to
$${\mathcal {O}}(10^{-11})$$
at 90% confidence level.
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