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

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arxiv 2005.00339 v2 pith:WPR4U7OS submitted 2020-05-01 hep-ex

classification hep-ex
keywords mathrmsearchdecayexperimentflavourgammaleptonlight
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

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 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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Cited by 1 Pith paper

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    Expected and observed 95% CL limits on the ALP couplings to gluons and W bosons are derived for a 1 MeV ALP, from simulated ZZa/WWa events at the HL-LHC and from recast CMS Z+jets and W+jets measurements.

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