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Search for lepton-flavor-violating tau decays to ℓα at Belle

Journal Article · · Journal of High Energy Physics (Online)
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We report a search for the lepton-flavor-violating decays τ± → ℓ±α (ℓ = e, μ), where α is an undetected spin-0 particle, such as an axion-like particle using 736 × 106 tau lepton pairs collected by the Belle detector at the KEKB asymmetric-energy e+e− collider. We find no evidence of signal and obtain the most stringent upper limits on the branching fractions at 95% confidence level: $$\mathcal{B}$$ (τ± → e±α) < (0.4–6.4) × 10−4 and $$\mathcal{B}$$ (τ± → μ±α) < (0.2–3.5) × 10−4 at 95% confidence level for an α mass in the range 0.0 ≤ mα ≤ 1.6 GeV/c2.
Research Organization:
Univ. of Hawaii, Honolulu, HI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
SC0010504
OSTI ID:
3007267
Journal Information:
Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 8 Vol. 2025; ISSN 1029-8479
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

tau physics