Observation of ? (1620)0 and Evidence for ? (1690)0 in ?c+ ? ?-?+?+ Decays

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2019

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We 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.

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