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- Title
Search for lepton-flavor-violating tau-lepton decays to ℓγ at Belle.
- Authors
Uno, K.; Hayasaka, K.; Inami, K.; Adachi, I.; Aihara, H.; Asner, D. M.; Atmacan, H.; Aushev, T.; Ayad, R.; Babu, V.; Bennett, J.; Bernlochner, F.; Bessner, M.; Bhardwaj, V.; Biswal, J.; Bobrov, A.; Bonvicini, G.; Bozek, A.; Bračko, M.; Campajola, M.
- Abstract
Charged lepton flavor violation is forbidden in the Standard Model but possible in several new physics scenarios. In many of these models, the radiative decays τ± → ℓ±γ (ℓ = e, μ) are predicted to have a sizeable probability, making them particularly interesting channels to search at various experiments. An updated search via τ± → ℓ±γ using full data of the Belle experiment, corresponding to an integrated luminosity of 988 fb−1, is reported for charged lepton flavor violation. No significant excess over background predictions from the Standard Model is observed, and the upper limits on the branching fractions, B (τ± → μ±γ) ≤ 4.2 × 10−8 and B (τ± → e±γ) ≤ 5.6 × 10−8, are set at 90% confidence level.
- Subjects
STANDARD model (Nuclear physics); NEUTRINO mass; FLAVOR; LUMINOSITY; PHYSICS
- Publication
Journal of High Energy Physics, 2021, Vol 2021, Issue 10, p1
- ISSN
1126-6708
- Publication type
Article
- DOI
10.1007/JHEP10(2021)019