Search for charged-lepton flavor violation in Υ(2S) → ℓ∓τ± (ℓ = e, μ) decays at Belle
R. Dhamija,S. Nishida,A. Giri,I. Adachi,H. Aihara,D. M. Asner,T. Aushev,R. Ayad,V. Babu,S. Bahinipati,Sw. Banerjee,M. Bauer,P. Behera,K. Belous,J. Bennett,M. Bessner,V. Bhardwaj,D. Biswas,D. Bodrov,J. Borah,A. Bozek,M. Bračko,P. Branchini,T. E. Browder,A. Budano,M. Campajola,D. Červenkov,M.-C. Chang,P. Chang,V. Chekelian,B. G. Cheon,K. Chilikin,H. E. Cho,K. Cho,S.-K. Choi,Y. Choi,S. Choudhury,D. Cinabro,S. Das,G. De Nardo,G. De Pietro,F. Di Capua,J. Dingfelder,Z. Doležal,T. V. Dong,P. Ecker,D. Epifanov,T. Ferber,D. Ferlewicz,B. G. Fulsom,R. Garg,V. Gaur,P. Goldenzweig,E. Graziani,T. Gu,Y. Guan,K. Gudkova,C. Hadjivasiliou,K. Hayasaka,H. Hayashii,S. Hazra,M. T. Hedges,D. Herrmann,W.-S. Hou,C.-L. Hsu,T. Iijima,K. Inami,N. Ipsita,A. Ishikawa,R. Itoh,M. Iwasaki,W. W. Jacobs,E.-J. Jang,S. Jia,Y. Jin,K. K. Joo,A. B. Kaliyar,C. Kiesling,C. H. Kim,D. Y. Kim,K.-H. Kim,Y.-K. Kim,K. Kinoshita,P. Kodyš,T. Konno,A. Korobov,S. Korpar,P. Križan,P. Krokovny,M. Kumar,R. Kumar,K. Kumara,A. Kuzmin,Y.-J. Kwon,Y.-T. Lai,S. C. Lee,D. Levit,P. Lewis,L. K. Li,L. Li Gioi,J. Libby,K. Lieret,Y.-R. Lin,D. Liventsev,Y. Ma,M. Masuda,T. Matsuda,S. K. Maurya,F. Meier,M. Merola,F. Metzner,K. Miyabayashi,R. Mizuk,G. B. Mohanty,I. Nakamura,M. Nakao,A. Natochii,L. Nayak,M. Niiyama,N. K. Nisar,S. Ogawa,P. Pakhlov,G. Pakhlova,S. Pardi,H. Park,J. Park,A. Passeri,S. Patra,S. Paul,T. K. Pedlar,R. Pestotnik,L. E. Piilonen,T. Podobnik,E. Prencipe,M. T. Prim,N. Rout,G. Russo,S. Sandilya,L. Santelj,V. Savinov,G. Schnell,C. Schwanda,Y. Seino,K. Senyo,M. E. Sevior,W. Shan,C. Sharma,J.-G. Shiu,B. Shwartz,A. Sokolov,E. Solovieva,M. Starič,Z. S. Stottler,M. Sumihama,M. Takizawa,K. Tanida,F. Tenchini,K. Trabelsi,M. Uchida,T. Uglov,Y. Unno,S. Uno,P. Urquijo,S. E. Vahsen,K. E. Varvell,A. Vinokurova,D. Wang,E. Wang,M.-Z. Wang,S. Watanuki,E. Won,X. Xu,B. D. Yabsley,W. Yan,S. B. Yang,J. H. Yin,C. Z. Yuan,L. Yuan,Z. P. Zhang,V. Zhilich,V. Zhukova
arXiv (Cornell University)（2024）
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摘要
We report a search for the charged-lepton flavor violation in Υ(2S) → ℓ∓τ± (ℓ = e, μ) decays using a 25 fb−1 Υ(2S) sample collected by the Belle detector at the KEKB e+e− asymmetric-energy collider. We find no evidence for a signal and set upper limits on the branching fractions ( ℬ ) at 90 ℬ (Υ(2S) → μ∓τ±) < 0.23 × 10−6 and ℬ (Υ(2S) → e∓τ±) < 1.12 × 10−6.
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关键词
Beyond Standard Model,e +-e Experiments,Flavour Physics
