Searching for new physics at μ → e facilities with μ⁺ and π⁺ decays at rest
- Creators
-
Hill, Richard J.
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Plestid, Ryan
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Zupan, Jure
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 ≲ 52 MeV; an alternative strategy using π⁺ → e⁺νₑ may also be considered. We focus primarily on a search for a monoenergetic e+ produced via two-body decays μ⁺ → e⁺X or π⁺ → e⁺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 (μ⁺ → Z′e⁺), and heavy neutral leptons (π⁺ → e⁺N). 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
- ISSN
- 2470-0029
- United States Department of Energy
- DE-SC0019095
- United States Department of Energy
- DE-AC02-07CH11359
- United States Department of Energy
- DE-SC0011784
- United States Department of Energy
- DE-SC1019775
- National Science Foundation
- OAC-2103889
- United States Department of Energy
- DE-SC0011632
- United States Department of Energy
- DE-AC02-07CHI11359
- California Institute of Technology
- Walter Burke Institute for Theoretical Physics
- National Science Foundation
- PHY-1748958
- National Science Foundation
- PHY-1607611
- SCOAP3
- Caltech groups
- Walter Burke Institute for Theoretical Physics