학술논문

Search for Baryon-Number-Violating Processes in $B^-$ Decays to the $\bar{\Xi}_{c}^{0} \bar{\Lambda}_{c}^{-}$ Final State
Document Type
Working Paper
Author
Belle CollaborationGu, T.Savinov, V.Adachi, I.Aihara, H.Asner, D. M.Atmacan, H.Aushev, T.Ayad, R.Banerjee, Sw.Belous, K.Bennett, J.Bessner, M.Bhardwaj, V.Bhuyan, B.Biswas, D.Bobrov, A.Bodrov, D.Borah, J.Bozek, A.Bračko, M.Branchini, P.Browder, T. E.Budano, A.Campajola, M.Červenkov, D.Chang, M. -C.Chang, P.Cheon, B. G.Chilikin, K.Cho, K.Choi, S. -K.Choi, Y.Choudhury, S.Das, S.De Nardo, G.De Pietro, G.Dhamija, R.Di Capua, F.Dingfelder, J.Doležal, Z.Dong, T. V.Dubey, S.Ecker, P.Ferber, T.Ferlewicz, D.Fulsom, B. G.Gaur, V.Giri, A.Goldenzweig, P.Graziani, E.Guan, Y.Gudkova, K.Hadjivasiliou, C.Hayasaka, K.Hayashii, H.Hedges, M. T.Herrmann, D.Hou, W. -S.Hsu, C. -L.Ipsita, N.Ishikawa, A.Itoh, R.Iwasaki, M.Jacobs, W. W.Jia, S.Jin, Y.Joo, K. K.Kawasaki, T.Kiesling, C.Kim, C. H.Kim, D. Y.Kim, K. -H.Kim, Y. J.Kodyš, P.Korobov, A.Korpar, S.Kovalenko, E.Križan, P.Krokovny, P.Kuhr, T.Kumara, K.Kumita, T.Kwon, Y. -J.Lai, Y. -T.Lee, S. C.Levit, D.Li, L. K.Li, Y. B.Gioi, L. LiLiventsev, D.Masuda, M.Matsuda, T.Maurya, S. K.Meier, F.Merola, M.Metzner, F.Miyabayashi, K.Mizuk, R.Mohanty, G. B.Mussa, R.Nakamura, I.Nakao, M.Natkaniec, Z.Natochii, A.Nayak, L.Nayak, M.Niiyama, M.Nishida, S.Ogawa, S.Pakhlova, G.Pardi, S.Park, H.Park, J.Park, S. -H.Passeri, A.Patra, S.Paul, S.Pedlar, T. K.Pestotnik, R.Piilonen, L. E.Podobnik, T.Prencipe, E.Prim, M. T.Röhrken, M.Russo, G.Sandilya, S.Santelj, L.Schnell, G.Schwanda, C.Seino, Y.Senyo, K.Sevior, M. E.Shan, W.Sharma, C.Shiu, J. -G.Solovieva, E.Starič, M.Takizawa, M.Tamponi, U.Tanida, K.Tenchini, F.Tiwary, R.Trabelsi, K.Uchida, M.Unno, Y.Uno, S.Usov, Y.Vahsen, S. E.Varvell, K. E.Vinokurova, A.Wang, E.Wang, M. -Z.Wang, X. L.Watanuki, S.Won, E.Xu, X.Yabsley, B. D.Yan, W.Yang, S. B.Yuan, L.Zhang, Z. P.Zhilich, V.Zhukova, V.
Source
Subject
High Energy Physics - Experiment
Language
Abstract
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).
Comment: 7 pages, 2 figures, submitted to Phys. Rev. Lett