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Epifanov, D. Kotchetkov, D. Liventsev, D. M. Asner, D. Matvienko, D. Sahoo, D. Y. Kim, E. Guido, E. Nakano, E. Solovieva, E. Widmann, E. Won, F. Simon, F. Tenchini, G. B. Mohanty, G. Bonvicini, G. Inguglia, G. Karyan, G. Pakhlova, G. Russo, G. Schnell, G. Varner, H. Aihara, H. Atmacan, H. B. Jeon, H. Hayashii, H. K. Moon, H. Miyata, H. Ono, H. Park, H. Ye, I. Adachi, I. Badhrees, I. S. Lee, J. Biswal, J. B. Kim, J. E. Fast, J. F. Strube, J.-G. Shiu, J. Haba, J. K. Ahn, J. Libby, J. S. Lange, J. Yelton, K. Chilikin, K. Cho, K. Hayasaka, K. H. Kang, K. Inami, K. J. Nath, K. Kinoshita, K. K. Joo, K. Miyabayashi, K. Senyo, K. Tanida, K. T. Kim, L. E. Piilonen, L. K. Li, L. Li Gioi, L. Santelj, M. Berger, M. Bracko, M. E. Sevior, M. Gelb, M. Iwasaki, M. Lubej, M. Masuda, M. Merola, M. Nakao, M. Niiyama, M. Ritter, M. Staric, M. Takizawa, M. Uchida, M. Watanabe, M.-Z. Wang, N. Dash, N. Gabyshev, N. K. Nisar, N. Taniguchi, O. Schneider, P. Goldenzweig, P. Kodys, P. Krizan, P. Krokovny, P. 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Zhang","submitted_at":"2018-10-15T04:59:58Z","abstract_excerpt":"We report the first observation of the doubly-strange baryon $\\Xi(1620)^0$ in its decay to $\\Xi^-\\pi^+$ via $\\Xi_c^+ \\rightarrow \\Xi^- \\pi^+ \\pi^+$ decays based on a $980\\,{\\rm fb}^{-1}$ data sample collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. The mass and width are measured to be 1610.4 $\\pm$ 6.0 (stat) $^{+5.9}_{-3.5}$ (syst)~MeV$/c^2$ and 59.9 $\\pm$ 4.8 (stat) $^{+2.8}_{-3.0}$ (syst)~MeV, respectively. We obtain 4.0$\\sigma$ evidence of the $\\Xi(1690)^0$ with the same data sample. 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