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Evidence of a structure in $$\bar{K}^{0} \Lambda _{c}^{+}$$ K ¯ 0 Λ c + consistent with a charged $$\Xi _c(2930)^{+}$$ Ξ c ( 2930 ) + , and updated measurement of $$\bar{B}^{0} \rightarrow \bar{K}^{0} \Lambda _{c}^{+} \bar{\Lambda }_{c}^{-}$$ B ¯ 0 → K ¯ 0 Λ c + Λ ¯ c - at Belle

2018; Springer Science+Business Media; Volume: 78; Issue: 11 Linguagem: Inglês

10.1140/epjc/s10052-018-6425-5

1434-6052

Yuanxi Li, C. P. Shen, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, T. Aushev, R. Ayad, V. Babu, I. Badhrees, S. Bahinipati, Y. Ban, V. Bansal, P. K. Behera, C. Beleño, V. Bhardwaj, B. Bhuyan, J. P. Biswal, A. Bobrov, A. Bożek, M. Bračko, T. E. Browder, L. Cao, D. Červenkov, P. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, N. Dash, S. Di Carlo, J. Dingfelder, Z. Doležal, T. V. Dong, Z. Drásal, S. Eidelman, D. Epifanov, J. Fast, B. G. Fulsom, R. B. Garg, V. Gaur, N. Gabyshev, A. Garmash, Michael H. Gelb, A. Giri, P. Goldenzweig, B. Golob, J. Haba, K. Hayasaka, S. Hirose, W.-S. Hou, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, I. Jaeglé, H. B. Jeon, S. Jia, Y. Jin, K. K. Joo, A. B. Kaliyar, K. H. Kang, Yuji Katō, T. Kawasaki, D. Y. Kim, Jung Bin Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, Y.-J. Kwon, J. S. Lange, I. S. Lee, S. C. Lee, L. K. Li, L. Li Gioi, J. Libby, D. Liventsev, T. Luo, D. Matvienko, M. Merola, H. Miyata, R. Mizuk, H. K. Moon, T. Mori, R. Mussa, E. Nakano, T. Nanut, K. J. Nath, Z. Natkaniec, M. Nayak, N. K. Nisar, S. Nishida, K. Nishimura, K. Ogawa, S. Okuno, H. Ono, P. Pakhlov, G. Pakhlova, B. Pal, S. Pardi, H. Park, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, V. Popov, E. Prencipe, A. Rostomyan, G. Russo, Y. Sakai, M. Salehi, S. Sandilya, L. Šantelj, T. Sanuki, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, O. Seon, M. E. Sevior, T.-A. Shibata, J.-G. Shiu, E. Solovieva, M. Starič, J. Strube, M. Sumihama, T. Sumiyoshi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, M. Uchida, T. Uglov, Y. Unno, S. Uno, Y. Usov, C. Van Hulse, R. van Tonder, G. Varner, K. E. Varvell, V. Vorobyev, E. Waheed, B. Wang, C. H. Wang, M.-Z. Wang, P. Wang, X. L. Wang, S. Watanuki, E. Widmann, E. Won, 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 report evidence for the charged charmed-strange baryon $\Xi_{c}(2930)^+$ with a signal significance of 3.9$\sigma$ with systematic errors included. The charged $\Xi_{c}(2930)^+$ is found in its decay to $K_{S}^{0} \Lambda_{c}^+$ in the substructure of $\bar{B}^{0} \to K^{0}_{S} \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-}$ decays. The measured mass and width are $[2942.3 \pm 4.4 (\rm stat.) \pm 1.5(\rm syst.)]$~MeV/$c^{2}$ and $[14.8 \pm 8.8(\rm stat.) \pm 2.5(\rm syst.)]$~MeV, respectively, and the product branching fraction is $\cal{B}(\bar{B}^{0} \to \Xi_c(2930)^{+} \bar{\Lambda}_{c}^{-}) \cal{B}(\Xi_c(2930)^{+}\to \bar{K}^{0} \Lambda_{c}^{+})=[2.37 \pm 0.51 (\rm stat.)\pm 0.31(\rm syst.)]\times 10^{-4}$. We also measure $\cal{B}(\bar{B}^{0} \to \bar{K}^{0} \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-}) = [3.99 \pm 0.76(\rm stat.) \pm 0.51(\rm syst.)] \times 10^{-4}$ with greater precision than previous experiments, and present the results of a search for the charmonium-like state $Y(4660)$ and its spin partner, $Y_{\eta}$, in the $\Lambda_{c}^{+}\bar{\Lambda}_{c}^{-}$ invariant mass spectrum. No clear signals of the $Y(4660)$ or $Y_{\eta}$ are observed and the 90\% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of $(772\pm11)\times 10^{6} B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance by the Belle detector at the KEKB asymmetric energy electron-positron collider.