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First measurements of absolute branching fractions of the Ξ c + baryon at Belle

2019; American Physical Society; Volume: 100; Issue: 3 Linguagem: Inglês

10.1103/physrevd.100.031101

2470-0037

Y. B. Li, C. P. Shen, I. Adachi, J. K. Ahn, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, V. Babu, A. M. Bakich, Y. Ban, V. Bansal, P. K. Behera, C. Beleño, M. Berger, V. Bhardwaj, B. Bhuyan, T. Bilka, J. P. Biswal, A. Bobrov, A. Bożek, M. Bračko, T. E. Browder, M. Campajola, L. Cao, D. Červenkov, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, S. Di Carlo, Z. Doležal, D. Dossett, S. Eidelman, D. Epifanov, J. Fast, T. Ferber, B. G. Fulsom, R. B. Garg, V. Gaur, N. Gabyshev, A. Garmash, A. Giri, P. Goldenzweig, B. Grube, O. Grzymkowska, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, W.-S. Hou, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, M. Iwasaki, M. Iwasaki, W. W. Jacobs, S. Jia, Y. Jin, D. Joffe, K. K. Joo, A. B. Kaliyar, G. Karyan, Yuji Katō, T. Kawasaki, H. Kichimi, C. H. Kim, D. Y. Kim, H. J. Kim, K. T. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, R. Kulasiri, A. Kuzmin, Y.-J. Kwon, K. Lalwani, J. S. Lange, I. S. Lee, J. K. Lee, J. Y. Lee, S. C. Lee, C. H. Li, L. K. Li, L. Li Gioi, J. Libby, K. Lieret, D. Liventsev, P.-C. Lu, J. MacNaughton, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, K. Miyabayashi, H. Miyata, R. Mizuk, G.B. Mohanty, T. J. Moon, R. Mussa, M. Nakao, K. J. Nath, M. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, K. Nishimura, S. Ogawa, H. Ono, Y. Onuki, P. Pakhlov, G. Pakhlova, B. Pal, S. Pardi, H. Park, S.-H. Park, S. Patra, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, V. Popov, E. Prencipe, M. Ritter, A. Rostomyan, G. Russo, D. Sahoo, Y. Sakai, M. Salehi, L. Ŝantelj, T. Sanuki, V. Savinov, O. Schneider, G. Schnell, J. Schueler, C. Schwanda, A. J. Schwartz, Y. Seino, K. Senyo, M. E. Sevior, V. Shebalin, J.-G. Shiu, B. Shwartz, F. Simon, A. Sokolov, E. Solovieva, M. Starič, Z. S. Stottler, J. Strube, M. Sumihama, T. Sumiyoshi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, M. Uchida, T. Uglov, Y. Unno, S. Uno, Y. Ushiroda, S. Vahsen, R. van Tonder, G. Varner, A. Vinokurova, B. Wang, C. H. Wang, M.-Z. Wang, P. Wang, S. Watanuki, E. Won, S. B. Yang, H. Ye, J. Yelton, J. H. Yin, C. Z. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, V. Zhukova, V. Zhulanov,

High-Energy Particle Collisions Research

We present the first measurements of the absolute branching fractions of $\Xi_c^+$ decays into $\Xi^- \pi^+ \pi^+$ and $p K^- \pi^+$ final states. Our analysis is based on a data set of $(772\pm 11)\times 10^{6}$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB $e^+e^-$ collider. We measure the absolute branching fraction of $\bar{B}^{0} \to \bar{\Lambda}_{c}^{-} \Xi_{c}^{+}$ with the $\Xi_c^+$ recoiling against $\bar{\Lambda}_c^-$ in $\bar{B}^0$ decays resulting in ${\cal B}(\bar{B}^{0} \to \bar{\Lambda}_{c}^{-} \Xi_{c}^{+}) = [1.16 \pm 0.42(\rm stat.) \pm 0.15(\rm syst.)] \times 10^{-3}$. We then measure the product branching fractions ${\cal B}(\bar{B}^{0} \to \bar{\Lambda}_c^- \Xi_c^+){\cal B}(\Xi_c^+ \to \Xi^- \pi^+ \pi^+)$ and ${\cal B}(\bar{B}^{0} \to \bar{\Lambda}_c^- \Xi_c^+){\cal B}(\Xi_c^+ \to p K^- \pi^+)$. Dividing these product branching fractions by $\bar{B}^{0} \to \bar{\Lambda}_{c}^{-} \Xi_{c}^{+}$ yields: ${\cal B}(\Xi_c^+ \to \Xi^- \pi^+ \pi^+) = [2.86 \pm 1.21(\rm stat.) \pm 0.38(\rm syst.)]\%$ and ${\cal B}(\Xi_c^+ \to p K^- \pi^+)=[0.45 \pm 0.21(\rm stat.) \pm 0.07(\rm syst.)]\%$. Our result for ${\cal B}(\Xi_c^+ \to \Xi^- \pi^+ \pi^+)$ can be combined with $\Xi_c^+$ branching fractions measured relative to $\Xi_c^+ \to \Xi^- \pi^+ \pi^+$ to set the absolute scale for many $\Xi_c^+$ branching fractions.