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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 | 2024/01 |
| 形態種別 | その他 |
| 標題 | Search for Baryon-Number-Violating Processes in $B^-$ Decays to the $\barΞ_{c}^{0} \barΛ_{c}^{-}$ Final State |
| 執筆形態 | その他 |
| 著者・共著者 | Belle Collaboration,T. Gu,V. Savinov,I. Adachi,H. Aihara,D. M. Asner,H. Atmacan,T. Aushev,R. Ayad,Sw. Banerjee,K. Belous,J. Bennett,M. Bessner,V. Bhardwaj,B. Bhuyan,D. Biswas,A. Bobrov,D. Bodrov,J. Borah,A. Bozek,M. Bračko,P. Branchini,T. E. Browder,A. Budano,M. Campajola,D. Červenkov,M. -C. Chang,P. Chang,B. G. Cheon,K. Chilikin,K. Cho,S. -K. Choi,Y. Choi,S. Choudhury,S. Das,G. De Nardo,G. De Pietro,R. Dhamija,F. Di Capua,J. Dingfelder,Z. Doležal,T. V. Dong,S. Dubey,P. Ecker,T. Ferber,D. Ferlew |
| 概要 | We report the results of the first search for $B^-$ decays to the
$\bar{\Xi}_{c}^{0} \bar{\Lambda}_{c}^{-}$ final state using 711~${\rm fb^{-1 } }$ of data collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. The results are interpreted in terms of both direct baryon-number-violating $B^-$ decay and $\Xi_{c}^{0}-\bar{\Xi}_{c}^{0}$ oscillations which follow the Standard Model decay $B^- \to \Xi_{c}^{0} \bar{\Lambda}_{c}^{-}$. We observe no evidence for baryon number violation and set the 95\% confidence-level upper limits on the ratio of baryon-number-violating and Standard Model branching fractions ${\mathcal{B}(B^- \rightarrow \bar{\Xi}_{c}^{0} \bar{\Lambda}_{c}^{-})}/{\mathcal{B}(B^- \rightarrow \Xi_{c}^{0} \bar{\Lambda}_{c}^{-})}$ to be $< 2.7\%$ and on the $\Xi_{c}^{0} - \bar{\Xi}_{c}^{0}$ oscillation angular frequency $\omega$ to be $< 0.76\ \mathrm{ps}^{-1}$ (equivalent to $\tau_{\rm mix} > 1.3$~ps). |
| PermalinkURL | http://arxiv.org/abs/2401.04807v2 |
| researchmap用URL | http://arxiv.org/pdf/2401.04807v2 |