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

Belle Collaboration; 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.; ... mehr

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.

Verlagsausgabe §
DOI: 10.5445/IR/1000139358
Veröffentlicht am 29.10.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Experimentelle Teilchenphysik (ETP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1029-8479, 1126-6708, 1127-2236
KITopen-ID: 1000139358
Erschienen in Journal of High Energy Physics
Verlag Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Band 2021
Heft 10
Seiten Article: 19
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Nachgewiesen in arXiv
Web of Science
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