Search for Baryon-Number-Violating Processes in $B^{-}$ Decays to the ${\overline{\mathrm{\Xi }}}_c^0{\overline{\mathrm{\Lambda }}}_c^{-}$ Final State

Journal Article · 14 August 2024 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.133.071802 · OSTI ID:2429615

Gu, 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. ; Li Gioi, L. ; Liventsev, 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.

We report the results of the first search for $B^{-}$ decays to the ${\overline{\mathrm{\Xi }}}_c^0{\overline{\mathrm{\Lambda }}}_c^{-}$ final state using $711{\mathrm{fb}}^{-1}$ of data collected at the $\mathrm{\Upsilon }\left(4S\right)$ 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 ${\mathrm{\Xi }}_c^0-{\overline{\mathrm{\Xi }}}_c^0$ oscillations which follow the standard model decay $B^{-}\to {\mathrm{\Xi }}_c^0{\overline{\mathrm{\Lambda }}}_c^{-}$ . 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 $\mathcal{B}(B^{-}\to {\overline{\mathrm{\Xi }}}_c^0{\overline{\mathrm{\Lambda }}}_c^{-})/\mathcal{B}(B^{-}\to {\mathrm{\Xi }}_c^0{\overline{\mathrm{\Lambda }}}_c^{-})$ to be $<2.7\%$ and on the effective angular frequency of mixing $\omega$ in ${\mathrm{\Xi }}_c^0-{\overline{\mathrm{\Xi }}}_c^0$ oscillations to be $<0.76{\mathrm{ps}}^{-1}$ (equivalent to ${\tau }_{\mathrm{mix}}>1.3\mathrm{ps}$ ). Published by the American Physical Society 2024

• Sponsoring Organization: USDOE
• OSTI ID: 2429615
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 7 Vol. 133; ISSN 0031-9007; ISSN PRLTAO
• Publisher: American Physical SocietyCopyright Statement
• Country of Publication: United States
• Language: English