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Search for lepton-flavor-violating tau-lepton decays to $\ell\gamma$ at Belle

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arxiv 2103.12994 v6 pith:KV6TLPBS submitted 2021-03-24 hep-ex

K. Uno , K. Hayasaka , K. Inami , I. Adachi , H. Aihara , D. M. Asner , H. Atmacan , T. Aushev
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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. Hara O. Hartbrich H. Hayashii M. Hernandez Villanueva W.-S. Hou C.-L. Hsu T. Iijima G. Inguglia A. Ishikawa R. Itoh M. Iwasaki W. W. Jacobs Y. Jin K. K. Joo K. H. Kang Y. Kato H. Kichimi C. Kiesling C. H. Kim D. Y. Kim K.-H. Kim S. H. Kim P. Kodyv T. Konno A. Korobov S. Korpar E. Kovalenko P. Kriv R. Kroeger P. Krokovny T. Kuhr M. Kumar R. Kumar K. Kumara A. Kuzmin Y.-J. Kwon Y.-T. Lai J. S. Lange S. C. Lee Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev C. MacQueen M. Masuda K. Matsuoka D. Matvienko M. Merola F. Metzner K. Miyabayashi R. Mizuk G. B. Mohanty M. Nakao H. Nakazawa A. Natochii L. Nayak M. Niiyama N. K. Nisar S. Nishida K. Nishimura K. Ogawa S. Ogawa P. Oskin P. Pakhlov G. Pakhlova S. Pardi H. Park S.-H. Park S. Paul R. Pestotnik L. E. Piilonen T. Podobnik E. Prencipe M. T. Prim M. R A. Rostomyan N. Rout G. Russo D. Sahoo S. Sandilya A. Sangal L. Santelj T. Sanuki V. Savinov G. Schnell C. Schwanda Y. Seino K. Senyo M. E. Sevior C. Sharma C. P. Shen J.-G. Shiu B. Shwartz F. Simon A. Sokolov E. Solovieva M. Stariv Z. S. Stottler M. Sumihama T. Sumiyoshi W. Sutcliffe M. Takizawa K. Tanida Y. Tao F. Tenchini K. Trabelsi M. Uchida S. Uehara T. Uglov Y. Unno S. Uno P. Urquijo Y. Ushiroda Y. Usov R. Van Tonder G. Varner A. Vinokurova A. Vossen E. Waheed C. H. Wang E. Wang M.-Z. Wang X. L. Wang O. Werbycka E. Won B. D. Yabsley W. Yan H. Ye J. H. Yin Y. Yusa Z. P. Zhang V. Zhilich V. Zhukova (The Belle Collaboration)
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classification hep-ex
keywords gammarightarrowsearchbellechargeddecaysflavorlepton
verification ladder T0 review T1 audit T2 compute T3 formal
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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 $\tau^{\pm}\rightarrow\ell^{\pm}\gamma$ ($\ell=e,\mu$) 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.

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