Published February 1, 2024 | Published
Journal Article Open

Searching for new physics at μ → e facilities with μ⁺ and π⁺ decays at rest

Abstract

We investigate the ability of μ e facilities, Mu2e and COMET, to probe, or discover, new physics with their detector validation datasets. The validation of the detector response may be performed using a dedicated run with μ+, collecting data below the Michel edge, Eₑ 52MeV; an alternative strategy using πe⁺νₑ may also be considered. We focus primarily on a search for a monoenergetic e+ produced via two-body decays μeX or πe⁺X, with X a light new physics particle. Mu2e can potentially explore new parameter space beyond present astrophysical and laboratory constraints for a set of well motivated models including axionlike particles with flavor violating couplings (μ+e+a), massive Z bosons (μZe), and heavy neutral leptons (πeN). The projected sensitivities presented herein can be achieved in a matter of days.

Copyright and License

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Funding

Funded by SCOAP3.

Acknowledgement

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Additional details

Created:
February 29, 2024
Modified:
February 29, 2024