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Nayak, L.; Adachi, I.; Aihara, H.; Asner, D. M.; Aulchenko, V.; Bahinipati, S.; Belous, K.; Bessner, M.; Bhuyan, B.; Biswas, D.; Bodrov, D.; Borah, J.; Bozek, A.; Branchini, P.; Budano, A.; Červenkov, D.; Cheon, B. G.; Chilikin, K.; Cho, K.; Choi, S.-K.; Choi, Y.; Choudhury, S.; Cochran, J.; De Pietro, G.; Di Capua, F.; Dingfelder, J.; Dossett, D.; Epifanov, D.; Fulsom, B. G.; Garg, R.; Gaur, V.; Graziani, E.; Halder, S.; Hara, T.; Hayasaka, K.; Hayashii, H.; Herrmann, D.; Inami, K.; Inguglia, G.; Ipsita, N.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Jia, S.; Kaliyar, A. B.; Kawasaki, T.; Kim, D. Y.; Kim, K.-H.; Kim, Y.-K.; Konno, T.; Korobov, A.; Korpar, S.; Krokovny, P.; Kumar, M.; Kumar, R.; Kwon, Y.-J.; Li, L. K.; Libby, J.; Lieret, K.; Lin, Y.-R.; Liventsev, D.; Luo, T.; Ma, Y.; Metzner, F.; Nakamura, I.; Pakhlov, P.; Pakhlova, G.; Pang, T.; Park, J.; Pedlar, T. K.; Pestotnik, R.; Podobnik, T.; Rostomyan, A.; Santelj, L.; Savinov, V.; Schwartz, A. J.; Seino, Y.; Senyo, K.; Shapkin, M.; Sharma, C.; Sibidanov, A.; Solovieva, E.; Starič, M.; Sumihama, M.; Takizawa, M.; Unno, Y.; Uno, K.; Varvell, K. E.; Vinokurova, A.; Watanuki, S.; Won, E.; Yabsley, B. D.; Yelton, J.; Yook, Y.; Yuan, L.; Yusa, Y.; Zhai, Y.; Zhang, Z. P.; Zhilich, V.; Zhukova, V.
The journal of high energy physics, 08/2023, Letnik: 2023, Številka: 8Journal Article
A bstract We present a search for the lepton-flavor-violating decays $$ {B}_s^0 $$ B s 0 → ℓ ∓ τ ± , where ℓ = e, μ , using the full data sample of 121 fb − 1 collected at the Υ(5 S ) resonance with the Belle detector at the KEKB asymmetric-energy e + e − collider. We use $$ {B}_s^0{\overline{B}}_s^0 $$ B s 0 B ¯ s 0 events in which one $$ {B}_s^0 $$ B s 0 meson is reconstructed in a semileptonic decay mode and the other in the signal mode. We find no evidence for $$ {B}_s^0 $$ B s 0 → ℓ ∓ τ ± decays and set upper limits on their branching fractions at 90% confidence level as $$ \mathcal{B} $$ B ( $$ {B}_s^0 $$ B s 0 → e ∓ τ ± ) < 14 × 10 − 4 and $$ \mathcal{B} $$ B ( $$ {B}_s^0 $$ B s 0 → μ ∓ τ ± ) < 7 . 3 × 10 − 4 . Our result represents the first upper limit on the $$ {B}_s^0 $$ B s 0 → e ∓ τ ± decay rate.
