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arxiv 1810.06181 v1 pith:PRC7ZGU6 submitted 2018-10-15 hep-ex nucl-ex

Observation of Xi(1620)⁰ and evidence for Xi(1690)⁰ in Xi_c^+ rightarrow Xi^-π^+π^+ decays

Belle collaboration: M. Sumihama , I. Adachi , J. K. Ahn , H. Aihara , S. Al Said , D. M. Asner , H. Atmacan , T. Aushev
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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 T. Matsuda D. Matvienko M. Merola K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty H. K. Moon T. Mori R. Mussa E. Nakano T. Nakano M. Nakao T. Nanut K. J. Nath Z. Natkaniec M. Niiyama N. K. Nisar S. Nishida H. Ono P. Pakhlov G. Pakhlova B. Pal S. Pardi H. Park S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen V. Popov M. Ritter G. Russo D. Sahoo S. Sandilya L. Santelj T. Sanuki V. Savinov O. Schneider G. Schnell C. Schwanda Y. Seino K. Senyo M. E. Sevior V. Shebalin C. P. Shen T.-A. Shibata J.-G. Shiu B. Shwartz F. Simon A. Sokolov E. Solovieva M. Staric J. F. Strube T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida N. Taniguchi F. Tenchini M. Uchida T. Uglov S. Uno P. Urquijo S. E. Vahsen C. Van Hulse G. Varner V. Vorobyev A. Vossen B. Wang C. H. Wang M.-Z. Wang P. Wang X. L. Wang M. Watanabe S. Watanuki E. Widmann E. Won H. Ye J. Yelton C. Z. Yuan Y. Yusa S. Zakharov Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov
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classification hep-ex nucl-ex
keywords datadecaysevidenceobservationrightarrowsamplestatsyst
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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. These results shed light on the structure of hyperon resonances with strangeness $S=-2$.

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