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Z. Yuan, D. Bodrov, D. Cinabro, D. Epifanov, D. Liventsev, D. M. Asner, D. Matvienko, D. Sahoo, D. \\v{C}ervenkov, D. Wang, D. Y. Kim, E. Graziani, E.-J. Jang, E. Kovalenko, E. Prencipe, E. Solovieva, E. Waheed, E. Wang, E. Won, F. Di Capua, F. Metzner, F. Simon, F. Tenchini, G. B. Mohanty, G. De Nardo, G. De Pietro, G. Inguglia, G. Karyan, G. Pakhlova, G. Russo, G. Schnell, G. Varner, H. Aihara, H. Atmacan, H. E. Cho, H. Hayashii, H. Ono, H. Park, H. Ye, I. Adachi, J. Bennett, J. Borah, J. B. Singh, J. Dingfelder, J. F. Strube, J.-G. Shiu, J. H. Yin, J. Kahn, J. Li, J. Libby, J. S. Lange, J. Yelton, K. Belous, K. Chilikin, K. Cho, K. Hayasaka, K. H. Kang, K.-H. Kim, K. Inami, K. Kinoshita, K. K. Joo, K. Kumara, K. Lalwani, K. Lieret, K. Miyabayashi, K. Ogawa, K. Senyo, K. Tanida, K. T. Kim, K. Trabelsi, L. E. Piilonen, L. K. Li, L. Li Gioi, L. Nayak, L. Santelj, M. Bessner, M. Bra\\v{c}ko, M. Campajola, M.-C. Chang, M. E. Sevior, M. Hernandez Villanueva, M. Iwasaki, M. Kumar, M. Masuda, M. Merola, M. Nakao, M. Nayak, M. R\\\"ohrken, M. Shapkin, M. Stari\\v{c}, M. Sumihama, M. Takizawa, M. T. Hedges, M. T. Prim, M. Uchida, M.-Z. Wang, N. Gabyshev, N. K. Nisar, N. Rout, P. Behera, P. Branchini, P. Chang, P. Goldenzweig, P. Kody\\v{s}, P. Kri\\v{z}an, P. Krokovny, P. Oskin, P. Pakhlov, P. Urquijo, R. Ayad, R. Dhamija, R. Garg, R. Itoh, R. Kroeger, R. Kumar, R. Mizuk, R. Mussa, R. Pestotnik, R. van Tonder, S. Al Said, S. Bahinipati, S. B. Yang, S. Choudhury, S. C. Lee, S. Cunliffe, S. Das, S.-H. Park, S.-J. Cho, S. Jia, S.-K. Choi, S. Korpar, S. Nishida, S. Ogawa, S. Pardi, S. Paul, S. Sandilya, S. Uno, S. Watanuki, T. Aushev, T. Bilka, T. E. Browder, T. Ferber, T. Gu, T. Hara, T. Iijima, T. Kawasaki, T. Konno, T. K. Pedlar, T. Kuhr, T. Lam, T. Matsuda, T. Pang, T. Podobnik, T. Sanuki, T. Sumiyoshi, T. Uglov, T. V. Dong, U. Tamponi, V. Babu, V. Bhardwaj, V. Gaur, V. Popov, V. Savinov, V. Zhilich, V. Zhukova, V. Zhulanov, W.-S. Hou, W. W. Jacobs, W. Yan, X. Xu, Y. B. Li, Y. Choi, Y. Iwasaki, Y. Jin, Y.-J. Kwon, Y.-K. Kim, Y. Li, Y. Onuki, Y. Seino, Y. Unno, Y. Usov, Y. Yusa, Y. Zhai, Z. Dole\\v{z}al, Z. P. Zhang, Z. S. Stottler","submitted_at":"2022-01-24T11:55:26Z","abstract_excerpt":"We present a search for the charged lepton-flavor-violating decays $\\Upsilon(1S)\\rightarrow\\ell\\ell^\\prime$ and radiative charged lepton-flavour-violating decays $\\Upsilon(1S)\\rightarrow\\gamma\\ell\\ell^\\prime$ [$\\ell,\\ell^\\prime = e, \\mu, \\tau$] using the 158 million $\\Upsilon(2S)$ sample collected by the Belle detector at the KEKB collider. This search uses $\\Upsilon(1S)$ mesons produced in $\\pi^+\\pi^-\\Upsilon(1S)$ transitions. 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Pardi, S. Paul, S. Sandilya, S. Uno, S. Watanuki, T. Aushev, T. Bilka, T. E. Browder, T. Ferber, T. Gu, T. Hara, T. Iijima, T. Kawasaki, T. Konno, T. K. Pedlar, T. Kuhr, T. Lam, T. Matsuda, T. Pang, T. Podobnik, T. Sanuki, T. Sumiyoshi, T. Uglov, T. V. Dong, U. Tamponi, V. Babu, V. Bhardwaj, V. Gaur, V. Popov, V. Savinov, V. Zhilich, V. Zhukova, V. Zhulanov, W.-S. Hou, W. W. Jacobs, W. Yan, X. Xu, Y. B. Li, Y. Choi, Y. Iwasaki, Y. Jin, Y.-J. Kwon, Y.-K. Kim, Y. Li, Y. Onuki, Y. Seino, Y. Unno, Y. Usov, Y. Yusa, Y. Zhai, Z. Dole\\v{z}al, Z. P. Zhang, Z. S. Stottler","submitted_at":"2022-01-24T11:55:26Z","abstract_excerpt":"We present a search for the charged lepton-flavor-violating decays $\\Upsilon(1S)\\rightarrow\\ell\\ell^\\prime$ and radiative charged lepton-flavour-violating decays $\\Upsilon(1S)\\rightarrow\\gamma\\ell\\ell^\\prime$ [$\\ell,\\ell^\\prime = e, \\mu, \\tau$] using the 158 million $\\Upsilon(2S)$ sample collected by the Belle detector at the KEKB collider. 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