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We propose a search at Mu3e for lepton flavor violating axion(-like)particles in $\mu\to 3e + a$ decays. By requiring an additional $e^+e^-$ pairfrom internal conversion, one can circumvent the calibration challenges whichplague the $\mu \to e+a$ channel for axions lighter than 20 MeV. Crucially, thecorresponding reduction in signal rate is to a large extent compensated for byMu3e's ability to resolve highly collimated tracks. For phase I of Mu3e, weproject a sensitivity to decay constants as high as $6\times 10^9$ GeV whichprobes uncharted parameter space in scenarios of axion dark matter. Thesensitivity to axions which couple primarily to right-handed leptons can befurther improved by leveraging the polarisation of the muon beam.

A Robust Search for Lepton Flavour Violating Axions at Mu3e