Sumihama M.Adachi I.Ahn J.K.Aihara H.Al Said S.Asner D.M.Atmacan H.Aushev T.Ayad R.Babu V.Badhrees I.Bahinipati S.Bakich A.M.Bansal V.Bele�o C.Berger M.Bhardwaj V.Bhuyan B.Bilka T.Biswal J.Bonvicini G.Bozek A.Bra?ko M.Browder T.E.?ervenkov D.Chekelian V.Chen A.Cheon B.G.Chilikin K.Cho K.Choi S.-K.Choi Y.Choudhury S.Cinabro D.Cunliffe S.Czank T.Dash N.Di Carlo S.Dole�al Z.Dong T.V.Dr�sal Z.Eidelman S.Epifanov D.Fast J.E.Fulsom B.G.Garg R.Gaur V.Gabyshev N.Garmash A.Gelb M.Giri A.Goldenzweig P.Guido E.Haba J.Hayasaka K.Hayashii H.Hirose S.Hou W.-S.Inami K.Inguglia G.Ishikawa A.Itoh R.Iwasaki M.Iwasaki Y.Jacobs W.W.Jeon H.B.Jia S.Jin Y.Joo K.K.Julius T.Kaliyar A.B.Kang K.H.Karyan G.Kato Y.Kiesling C.Kim D.Y.Kim J.B.Kim K.T.Kim S.H.Kinoshita K.Kody� P.Korpar S.Kotchetkov D.Kri�an P.Kroeger R.Krokovny P.Kumar R.Kuzmin A.Kwon Y.-J.Lange J.S.Lee I.S.Lee S.C.Li L.K.Li Y.B.Li Gioi L.Libby J.Liventsev D.Lubej M.Luo T.Masuda M.Matsuda T.Matvienko D.Merola M.Miyabayashi K.Miyata H.Mizuk R.Mohanty G.B.Moon H.K.Mori T.Mussa R.Nakano E.Nakano T.Nakao M.Nanut T.Nath K.J.Natkaniec Z.Niiyama M.Nisar N.K.Nishida S.Ono H.Pakhlov P.Pakhlova G.Pal B.Pardi S.Park H.Paul S.Pedlar T.K.Pestotnik R.Piilonen L.E.Popov V.Ritter M.Russo G.Sahoo D.Sandilya S.Santelj L.Sanuki T.Savinov V.Schneider O.Schnell G.Schwanda C.Seino Y.Senyo K.Sevior M.E.Shebalin V.Shen C.P.Shibata T.-A.Shiu J.-G.Shwartz B.Simon F.Sokolov A.Solovieva E.Stari? M.Strube J.F.Sumiyoshi T.Takizawa M.Tamponi U.Tanida K.Taniguchi N.Tenchini F.Uchida M.Uglov T.Uno S.Urquijo P.Vahsen S.E.Van Hulse C.Varner G.Vorobyev V.Vossen A.Wang B.Wang C.H.Wang M.-Z.Wang P.Wang X.L.Watanabe M.Watanuki S.Widmann E.Won E.Ye H.Yelton J.Yuan C.Z.Yusa Y.Zakharov S.Zhang Z.P.Zhilich V.Zhukova V.Zhulanov V.Belle Collaboration2025-02-1720192http://dx.doi.org/10.1103/PhysRevLett.122.072501https://idr.iitbbs.ac.in/handle/2008/2329We report the first observation of the double strange baryon ?(1620)0 in its decay to ?-?+ via ?c+??-?+?+ 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/c2 and 59.9�4.8(stat)-7.1+2.8(syst) MeV, respectively. We obtain 4.0? evidence of the ?(1690)0 with the same data sample. These results shed light on the structure of hyperon resonances with strangeness S=-2. � 2019 authors. Published by the American Physical Society.enArticle