Probing Muonphilic Force Carriers and Dark Matter at Kaon Factories
Rare kaon decays are excellent probes of light, new weakly-coupled particles. If such particles X couple preferentially to muons, they can be produced in K→ μ ν X decays. In this letter we evaluate the future sensitivity for this process at NA62 assuming X decays either invisibly or to di-muons. Our main physics target is the parameter space that resolves the (g-2)μ anomaly, where X is a gauged Lμ-Lτ vector or a muon-philic scalar. The same parameter space can also accommodate dark matter freeze out or reduce the tension between cosmological and local measurements of H0 if the new force decays to dark matter or neutrinos, respectively. We show that for invisible X decays, a dedicated single muon trigger analysis at NA62 could probe much of the remaining (g-2)μ favored parameter space. Alternatively, if X decays to muons, NA62 can perform a di-muon resonance search in K→ 3 μ ν events and greatly improve existing coverage for this process. Independently of its sensitivity to new particles, we find that NA62 is also sensitive to the Standard Model predicted rate for K → 3μ ν, which has never been measured.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Florida State Univ., Tallahassee, FL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
- Contributing Organization:
- Kavli Institute for theoretical physics in Santa Barbara
- Grant/Contract Number:
- AC02-07CH11359; SC0012012; PHY-1620074; 084011-550-042584; PHY-1748958
- OSTI ID:
- 1595513
- Alternate ID(s):
- OSTI ID: 1504475; OSTI ID: 1596627
- Report Number(s):
- arXiv:1902.07715; FERMILAB-PUB-18-665-A; KEK-TH-2105; PRLTAO; 041802
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Vol. 124 Journal Issue: 4; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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