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新山 雅之 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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| 発行・発表の年月 | 2021/08 |
| 形態種別 | その他 |
| 標題 | Search for $B^{0} \to τ^\pm \ell^\mp$ ($\ell=e,μ$) with a hadronic tagging method at Belle |
| 執筆形態 | その他 |
| 著者・共著者 | Belle Collaboration,H. Atmacan,A. J. Schwartz,K. Kinoshita,I. Adachi,K. Adamczyk,H. Aihara,S. Al Said,D. M. Asner,V. Aulchenko,T. Aushev,R. Ayad,V. Babu,S. Bahinipati,M. Bauer,P. Behera,K. Belous,J. Bennett,F. Bernlochner,M. Bessner,V. Bhardwaj,B. Bhuyan,T. Bilka,J. Biswal,A. Bobrov,A. Bozek,M. Bračko,P. Branchini,T. E. Browder,A. Budano,M. Campajola,L. Cao,D. Červenkov,M. -C. Chang,P. Chang,V. Chekelian,A. Chen,B. G. Cheon,K. Chilikin,H. E. Cho,K. Cho,S. -K. Choi,Y. Choi,S. Choudhury,D. Cinabro |
| 概要 | We present a search for the lepton-flavor-violating decays $B^{0} \to
\tau^\pm \ell^\mp$, where $\ell=(e,\,\mu)$, using the full data sample of $772 \times 10^6$ $B \overline{B}$ 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. The $\tau^\pm$ lepton is reconstructed indirectly using the momentum of the reconstructed $B$ and that of the $\ell^\mp$ from the signal decay. We find no evidence for $B^{0} \to \tau^\pm \ell^\mp$ decays and set upper limits on their branching fractions at 90% confidence level of $\cal B$($B^{0} \to \tau^\pm \mu^{\mp}$)$ < 1.5 \times 10^{-5}$ and $\cal B$($B^{0} \to \tau^\pm e^{\mp}$)$ < 1.6 \times 10^{-5}$. |
| PermalinkURL | http://arxiv.org/abs/2108.11649v2 |
| researchmap用URL | http://arxiv.org/pdf/2108.11649v2 |