Search for the Lepton Flavor Violating Decays B^{+}→K^{+}τ^{±}ℓ^{∓} (ℓ=e, μ) at Belle.
S Watanuki,G de Marino,K Trabelsi,I Adachi,H Aihara,D M Asner,H Atmacan,V Aulchenko,T Aushev,R Ayad,V Babu,Sw Banerjee,M Bauer,P Behera,K Belous,M Bessner,V Bhardwaj,B Bhuyan,D Biswas,D Bodrov,G Bonvicini,J Borah,A Bozek,M Bračko,P Branchini,T E Browder,A Budano,M Campajola,L Cao,D Červenkov,M-C Chang,B G Cheon,K Chilikin,K Cho,S-J Cho,S-K Choi,Y Choi,S Choudhury,D Cinabro,S Das,G De Nardo,G De Pietro,R Dhamija,F Di Capua,T V Dong,D Epifanov,T Ferber,D Ferlewicz,B G Fulsom,R Garg,V Gaur,A Garmash,A Giri,P Goldenzweig,E Graziani,T Gu,Y Guan,K Gudkova,C Hadjivasiliou,S Halder,X Han,T Hara,K Hayasaka,H Hayashii,D Herrmann,W-S Hou,C-L Hsu,K Inami,G Inguglia,N Ipsita,A Ishikawa,R Itoh,M Iwasaki,W W Jacobs,Q P Ji,S Jia,Y Jin,K K Joo,A B Kaliyar,H Kichimi,C H Kim,D Y Kim,K-H Kim,Y-K Kim,K Kinoshita,P Kodyš,A Korobov,S Korpar,E Kovalenko,P Križan,P Krokovny,T Kuhr,M Kumar,K Kumara,A Kuzmin,Y-J Kwon,J S Lange,M Laurenza,S C Lee,P Lewis,L K Li,Y Li,L Li Gioi,J Libby,Y-R Lin,D Liventsev,T Matsuda,S K Maurya,F Meier,M Merola,F Metzner,K Miyabayashi,R Mizuk,G B Mohanty,M Nakao,L Nayak,M Nayak,N K Nisar,S Nishida,H Ono,P Oskin,G Pakhlova,S Pardi,H Park,J Park,S-H Park,A Passeri,T K Pedlar,R Pestotnik,L E Piilonen,T Podobnik,E Prencipe,M T Prim,M Röhrken,N Rout,G Russo,S Sandilya,A Sangal,L Santelj,V Savinov,G Schnell,C Schwanda,Y Seino,K Senyo,M E Sevior,W Shan,M Shapkin,J-G Shiu,B Shwartz,F Simon,E Solovieva,M Starič,M Sumihama,T Sumiyoshi,M Takizawa,K Tanida,F Tenchini,M Uchida,T Uglov,Y Unno,K Uno,S Uno,R van Tonder,G Varner,K E Varvell,D Wang,E Wang,M-Z Wang,E Won,X Xu,B D Yabsley,W Yan,S B Yang,J Yelton,Y Yusa,Z P Zhang,V Zhilich,V Zhukova
Physical review letters（2023）
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摘要
We present a search for the lepton flavor violating decays B^{+}→K^{+}τ^{±}ℓ^{∓}, with ℓ=(e,μ), using the full data sample of 772×10^{6} BB[over ¯] pairs recorded by the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. We use events in which one B meson is fully reconstructed in a hadronic decay mode. We find no evidence for B^{±}→K^{±}τℓ decays and set upper limits on their branching fractions at the 90% confidence level in the (1-3)×10^{-5} range. The obtained limits are the world's best results.
