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

S. Patra,V. Bhardwaj,K. Trabelsi,I. Adachi,H. Aihara,S. Al Said, D. M. Asner,H. Atmacan,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. Bračko, P. Branchini,T. E. Browder,A. Budano,M. Campajola,D. Červenkov,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. Doležal,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. Kodyš,T. Konno,A. Korobov,S. Korpar,E. Kovalenko,P. Križan,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. Röhrken,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. Starič,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

Journal of High Energy Physics（2022）

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摘要

bstract We present a search for the charged lepton-flavor-violating decays ϒ(1 S ) → ℓ ± ℓ ′ ∓ and radiative charged lepton-flavour-violating decays ϒ(1 S ) → γ ℓ ± ℓ ′ ∓ [ ℓ , ℓ ′ = e, μ, τ ] using the 158 million ϒ(2 S ) sample collected by the Belle detector at the KEKB collider. This search uses ϒ(1 S ) mesons produced in ϒ(2 S ) → π + π − ϒ(1 S ) 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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