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arXiv · 1810.06181

Observation of $Ξ(1620)^0$ and evidence for $Ξ(1690)^0$ in $Ξ_c^+ \rightarrow Ξ^-π^+π^+$ decays

Belle collaboration·M. Sumihama·I. Adachi·J. K. Ahn·H. Aihara·S. Al Said·D. M. Asner·H. Atmacan·T. Aushev·R. Ayad·V. Babu·I. Badhrees·S. Bahinipati·A. M. Bakich·V. Bansal·C. Beleno·M. Berger·V. Bhardwaj·B. Bhuyan·T. Bilka·J. Biswal·G. Bonvicini·A. Bozek·M. Bracko·T. E. Browder·D. Cervenkov·V. Chekelian·A. Chen·B. G. Cheon·K. Chilikin·K. Cho·S. -K. Choi·Y. Choi·S. Choudhury·D. Cinabro·S. Cunliffe Czank·N. Dash·S. Di Carlo·Z. Dolezal·T. V. Dong·Z. Drasal·S. Eidelman·D. Epifanov·J. E. Fast·B. G. Fulsom·R. Garg·V. Gaur·N. Gabyshev·A. Garmash·M. Gelb·A. Giri·P. Goldenzweig·E. Guido·J. Haba·K. Hayasaka·H. Hayashii·S. Hirose·W. -S. Hou·K. Inami·G. Inguglia·A. Ishikawa·R. Itoh·M. Iwasaki·Y. Iwasaki·W. W. Jacobs·H. B. Jeon·S. Jia·Y. Jin·K. K. Joo·T. Julius·A. B. Kaliyar·K. H. Kang·G. Karyan·Y. Kato·C. Kiesling·D. Y. Kim·J. B. Kim·K. T. Kim·S. H. Kim·K. Kinoshita·P. Kodys·S. Korpar·D. Kotchetkov·P. Krizan·R. Kroeger·P. Krokovny·R. Kumar·A. Kuzmin·Y. -J. Kwon·J. S. Lange·I. S. Lee·S. C. Lee·L. K. Li·Y. B. Li·L. Li Gioi·J. Libby·D. Liventsev·M. Lubej·T. Luo·M. Masuda
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Abstract

We report the first observation of the doubly-strange baryon $Ξ(1620)^0$ in its decay to $Ξ^-π^+$ via $Ξ_c^+ \rightarrow Ξ^- π^+ π^+$ 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$σ$ evidence of the $Ξ(1690)^0$ with the same data sample. These results shed light on the structure of hyperon resonances with strangeness $S=-2$.

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Belle collaboration, M. Sumihama, I. Adachi, J. K. Ahn, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, V. Babu, I. Badhrees, S. Bahinipati, A. M. Bakich, V. Bansal, C. Beleno, M. Berger, V. Bhardwaj, B. Bhuyan, T. Bilka, J. Biswal, G. Bonvicini, A. Bozek, M. Bracko, T. E. Browder, D. Cervenkov, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S. -K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe Czank, N. Dash, S. Di Carlo, Z. Dolezal, T. V. Dong, Z. Drasal, S. Eidelman, D. Epifanov, J. E. Fast, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, M. Gelb, A. Giri, P. Goldenzweig, E. Guido, J. Haba, K. Hayasaka, H. Hayashii, S. Hirose, W. -S. Hou, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, H. B. Jeon, S. Jia, Y. Jin, K. K. Joo, T. Julius, A. B. Kaliyar, K. H. Kang, G. Karyan, Y. Kato, C. Kiesling, D. Y. Kim, J. B. Kim, K. T. Kim, S. H. Kim, K. Kinoshita, P. Kodys, S. Korpar, D. Kotchetkov, P. Krizan, R. Kroeger, P. Krokovny, R. Kumar, A. Kuzmin, Y. -J. Kwon, J. S. Lange, I. S. Lee, S. C. Lee, L. K. Li, Y. B. Li, L. Li Gioi, J. Libby, D. Liventsev, M. Lubej, T. Luo, M. Masuda. 2018-10-15. Observation of $Ξ(1620)^0$ and evidence for $Ξ(1690)^0$ in $Ξ_c^+ \rightarrow Ξ^-π^+π^+$ decays. https://doi.org/10.1103/physrevlett.122.072501

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