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We investigate the ability of $\mu\rightarrow e$ facilities, Mu2e and COMET,to probe, or discover, new physics with their detector validation datasets. Thevalidation of the detector response may be performed using a dedicated run with$\mu^+$, collecting data below the Michel edge, $E_e\lesssim 52$ MeV; analternative strategy using $\pi^+\rightarrow e^+ \nu_e$ may also be considered.We focus primarily on a search for a monoenergetic $e^+$ produced via two-bodydecays $\mu^+ \rightarrow e^+ X$ or $\pi^+\rightarrow e^+X$, with $X$ a lightnew physics particle. Mu2e can potentially explore new parameter space beyondpresent astrophysical and laboratory constraints for a set of well motivatedmodels including: axion like particles with flavor violating couplings ($\mu^+\rightarrow e^+ a$), massive $Z'$ bosons ($\mu^+ \rightarrow Z' e^+$), andheavy neutral leptons ($\pi^+\rightarrow e^+N$). The projected sensitivitiespresented herein can be achieved in a matter of days.

Searching for new physics at $\mu\rightarrow e$ facilities with $\mu^+$ and $\pi^+$ decays at rest