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Title: Searching for new physics at $μ → e$ facilities with $μ^+$ and $π^+$ decays at rest

Journal Article · · Physical Review. D.
ORCiD logo [1]; ORCiD logo [2];  [3]
  1. University of Kentucky, Lexington, KY (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
  2. California Institute of Technology (CalTech), Pasadena, CA (United States). Walter Burke Institute for Theoretical Physics; University of Kentucky, Lexington, KY (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
  3. University of Cincinnati, OH (United States)

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.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); Walter Burke Institute
Grant/Contract Number:
AC02-07CH11359; SC0019095; SC0011784; SC0011632
OSTI ID:
2202825
Alternate ID(s):
OSTI ID: 2315721; OSTI ID: 2479572
Report Number(s):
FERMILAB-PUB--23-287-T; CALT-TH/2023--017; arXiv:2310.00043; oai:inspirehep.net:2705152
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 3 Vol. 109; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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