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. 2023 Jun 30;130(26):261802.
doi: 10.1103/PhysRevLett.130.261802.

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; Belle Collaboration

Search for the Lepton Flavor Violating Decays B^{+}→K^{+}τ^{±}ℓ^{∓} (ℓ=e, μ) at Belle

S Watanuki et al. Phys Rev Lett. .

Abstract

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.

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