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Title: Search for a Nonrelativistic Boson in Two-Body Antimuon Decay

Journal Article · · Physical Review Letters
ORCiD logo [1];  [2]; ORCiD logo [1]
  1. Univ. of Chicago, IL (United States). Enrico Fermi Inst. and Kavli Institute for Cosmological Physics (KICP); Donostia International Physics Center (DIPC), San Sebastian (Spain)
  2. Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

We demonstrate the feasibility of probing the charged lepton-flavor-violating decay μ+ → e+ X0 for the presence of a slow-moving neutral boson X0 capable of undergoing gravitational binding to large structures and, as such, able to participate in some cosmological scenarios. A short exposure to surface antimuons from beam line M20 at TRIUMF generates a branching ratio limit of ≲ 10–5. This is comparable to or better than previous searches for this channel, although in a thus-far-unexplored region of X0 phase space very close to the kinematic limit of the decay, where mX0 approaches mμ+. The future improved sensitivity of the method using a customized p -type point-contact germanium detector is described.

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)
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1997539
Report Number(s):
FERMILAB-PUB-23-445-CSAID; arXiv:2308.05064; oai:inspirehep.net:2686628; TRN: US2405280
Journal Information:
Physical Review Letters, Vol. 131, Issue 24; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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