Observation of Ξ(1620)^{0} and Evidence for Ξ(1690)^{0} in Ξ_{c}^{+}→Ξ^{-}π^{+}π^{+} Decays. 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 Beleño , M Berger , V Bhardwaj , B Bhuyan , T Bilka , J Biswal , G Bonvicini , A Bozek , M Bračko , T E Browder , D Červenkov , V Chekelian , A Chen , B G Cheon , K Chilikin , K Cho , S-K Choi , Y Choi , S Choudhury , D Cinabro , S Cunliffe , T Czank , N Dash , S Di Carlo , Z Doležal , T V Dong , Z Drásal , 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 Kodyš , S Korpar , D Kotchetkov , P Križan , 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 Starič , 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 Physical review letters（2019）
摘要
We report the first observation of the double strange baryon Ξ(1620)^{0} in its decay to Ξ^{-}π^{+} via Ξ_{c}^{+}→Ξ^{-}π^{+}π^{+} decays based on a 980 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±6.0(stat)_{-4.2}^{+6.1} (syst) MeV/c^{2} and 59.9±4.8(stat)_{-7.1}^{+2.8}(syst) MeV, respectively. We obtain 4.0σ 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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