Observation of and updated measurement of at Belle - Belle Collaboration

2018
We report the first observation of the charmed-strange baryon with a significance greater than 5. The is found in its decay to in decays. The measured mass and width are MeV/ and MeV, respectively, and the product branching fractionis . We also measure with improved precision, and search for the charmonium-like state Y (4660) and its spin partner, , in the invariant massspectrum. No clear signals of the Y (4660) nor its spin partner are observed and the 90% credibility level (C.L.) upper limits on their production rates are determined. These measurements are obtained from a sample of pairs collected at the resonance by the Belle detector at the KEKBasymmetric energy electron–positron collider.
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