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新山 雅之 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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| 発行・発表の年月 | 2021/03 |
| 形態種別 | その他 |
| 標題 | Search for lepton-flavor-violating tau-lepton decays to $\ellγ$ at Belle |
| 執筆形態 | その他 |
| 著者・共著者 | K. Uno,K. Hayasaka,K. Inami,I. Adachi,H. Aihara,D. M. Asner,H. Atmacan,T. Aushev,R. Ayad,V. Babu,J. Bennett,F. Bernlochner,M. Bessner,V. Bhardwaj,J. Biswal,A. Bobrov,G. Bonvicini,A. Bozek,M. Brav,M. Campajola,D. v,M. -C. Chang,H. E. Cho,K. Cho,S. -J. Cho,S. -K. Choi,Y. Choi,S. Choudhury,D. Cinabro,S. Cunliffe,N. Dash,F. Di Capua,J. Dingfelder,Z. Dolev,T. V. Dong,S. Eidelman,D. Epifanov,T. Ferber,A. Frey,B. G. Fulsom,R. Garg,V. Gaur,N. Gabyshev,A. Garmash,A. Giri,P. Goldenzweig,C. Hadjivasiliou,T |
| 概要 | 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 $\tau^{\pm}\rightarrow\ell^{\pm}\gamma$ ($\ell=e,\mu$) are predicted to have a sizeable probability, making them particularly interesting channels to search at various experiments. An updated search via $\tau^{\pm}\rightarrow\ell^{\pm}\gamma$ 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, $\mathcal{B}(\tau^{\pm}\rightarrow \mu^{\pm}\gamma)$ $\leq$ $4.2\times10^{-8}$ and $\mathcal{B}(\tau^{\pm}\rightarrow e^{\pm}\gamma)$ $\leq$ $5.6\times10^{-8}$, are set at 90\% confidence level. |
| DOI | 10.1007/JHEP10(2021)019 |
| PermalinkURL | http://arxiv.org/abs/2103.12994v6 |
| researchmap用URL | http://arxiv.org/pdf/2103.12994v6 |