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

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 experim...

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Bibliographic Details
Published in:The journal of high energy physics 2021-10, Vol.2021 (10)
Main Authors: Uno, K., Hayasaka, K., Inami, K., Aihara, H., Aushev, T., Ayad, R., Babu, V., Bennett, J., Bonvicini, G., Cho, S. -J., Choi, S. -K., Choi, Y., Cinabro, D., Di Capua, F., Dingfelder, J., Dong, T. V., Ferber, T., Garg, R., Gaur, V., Gabyshev, N., Garmash, A., Giri, A., Goldenzweig, P., Hadjivasiliou, C., Hayashii, H., Hernandez Villanueva, M., Hou, W. -S., Hsu, C. -L., Inguglia, G., Ishikawa, A., Jin, Y., Joo, K. K., Kiesling, C., Kim, C. H., Kim, D. Y., Kim, S. H., Kodyš, P., Kroeger, R., Krokovny, P., Kuhr, T., Kumar, R., Kumara, K., Kuzmin, A., Kwon, Y. -J., Lai, Y. -T., Li, Y. B., Lieret, K., Liventsev, D., MacQueen, C., Matvienko, D., Miyabayashi, K., Mohanty, G. B., Nakazawa, H., Natochii, A., Nayak, L., Nisar, N. K., Nishida, S., Nishimura, K., Ogawa, K., Ogawa, S., Pakhlov, P., Pakhlova, G., Park, H., Piilonen, L. E., Röhrken, M., Rostomyan, A., Rout, N., Russo, G., Sahoo, D., Sakai, Y., Sanuki, T., Savinov, V., Schnell, G., Senyo, K., Sharma, C., Shen, C. P., Shiu, J. -G., Simon, F., Sokolov, A., Solovieva, E., Starič, M., Sumiyoshi, T., Sutcliffe, W., Tanida, K., Tenchini, F., Trabelsi, K., Uehara, S., Unno, Y., Ushiroda, Y., Vahsen, S. E., Van Tonder, R., Varner, G., Vinokurova, A., Vossen, A., Wang, C. H., Won, E., Yabsley, B. D., Ye, H., Yusa, Y., Zhilich, V.
Format: Article
Language:English
Subjects:
Charged lepton flavor violation
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Lepton number
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Taus
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Summary: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.
ISSN:1029-8479
1029-8479