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

Date Issued
2021-10-04
Author(s)
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.
Červenkov, D.
Chang, M.-C.
Cho, H. E.
Cho, K.
Cho, S.-J.
Choi, S.-K.
Choi, Y.
Choudhury, S.
Cinabro, D.
Cunliffe, S.
Dash, N.
Di Capua, F.
Dingfelder, J.
Doležal, Z.
Dong, T. V.
Eidelman, S.
Epifanov, D.
Ferber, T.
Fulsom, B. G.
Garg, R.
Gaur, V.
Gabyshev, N.
Garmash, A.
Giri, A.
Goldenzweig, P.
Hadjivasiliou, C.
Hara, T.
Hartbrich, O.
Hayashii, H.
DOI
10.1007/JHEP10(2021)019
Abstract
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

$ \mathcal{B} $
(τ± → μ±γ) ≤ 4.2 × 10−8 and




B

$ \mathcal{B} $
(τ± → e±γ) ≤ 5.6 × 10−8, are set at 90% confidence level.
Subjects
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