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arxiv: 2201.09620 · v3 · pith:OJD2FFBMnew · submitted 2022-01-24 · ✦ hep-ex

Search for charged lepton flavor violating decays of Upsilon(1S)

Belle Collaboration: S. Patra , V. Bhardwaj , K. Trabelsi , I. Adachi , H. Aihara , S. Al Said , D. M. Asner , H. Atmacan
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T. Aushev R. Ayad V. Babu S. Bahinipati P. Behera K. Belous J. Bennett M. Bessner B. Bhuyan T. Bilka A. Bobrov D. Bodrov J. Borah A. Bozek M. Bra\v{c}ko P. Branchini T. E. Browder A. Budano M. Campajola D. \v{C}ervenkov M.-C. Chang P. Chang A. Chen B. G. Cheon K. Chilikin H. E. Cho K. Cho S.-J. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe S. Das G. De Nardo G. De Pietro R. Dhamija F. Di Capua J. Dingfelder Z. Dole\v{z}al T. V. Dong D. Epifanov T. Ferber A. Frey B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Giri P. Goldenzweig E. Graziani T. Gu T. Hara K. Hayasaka H. Hayashii M. T. Hedges M. Hernandez Villanueva W.-S. Hou C.-L. Hsu T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs E.-J. Jang S. Jia Y. Jin K. K. Joo J. Kahn A. B. Kaliyar K. H. Kang G. Karyan T. Kawasaki C. Kiesling C. H. Kim D. Y. Kim K.-H. Kim K. T. Kim Y.-K. Kim K. Kinoshita P. Kody\v{s} T. Konno A. Korobov S. Korpar E. Kovalenko P. Kri\v{z}an R. Kroeger P. Krokovny T. Kuhr M. Kumar R. Kumar K. Kumara A. Kuzmin Y.-J. Kwon K. Lalwani T. Lam J. S. Lange S. C. Lee C. H. Li J. Li L. K. Li Y. Li Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev A. Martini M. Masuda T. Matsuda D. Matvienko M. Merola F. Metzner K. Miyabayashi R. Mizuk G. B. Mohanty R. Mussa M. Nakao A. Natochii L. Nayak M. Nayak N. K. Nisar S. Nishida K. Ogawa S. Ogawa H. Ono Y. Onuki P. Oskin P. Pakhlov G. Pakhlova T. Pang S. Pardi H. Park S.-H. Park A. Passeri S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik V. Popov E. Prencipe M. T. Prim M. R\"ohrken 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 M. Shapkin C. Sharma C. P. Shen J.-G. Shiu B. Shwartz F. Simon J. B. Singh A. Sokolov E. Solovieva M. Stari\v{c} Z. S. Stottler J. F. Strube M. Sumihama T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida F. Tenchini M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov R. Van Tonder G. Varner A. Vinokurova A. Vossen E. Waheed C. H. Wang D. Wang E. Wang M.-Z. Wang S. Watanuki E. Won X. Xu B. D. Yabsley W. Yan S. B. Yang H. Ye J. Yelton J. H. Yin C. Z. Yuan Y. Yusa Y. Zhai Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov
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classification ✦ hep-ex
keywords upsilonchargeddecaysprimesearchrightarrowbellebranching
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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. We do not find any significant signal, so we provide upper limits on the branching fractions at the 90% confidence level.

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