Observation of X(2370) and search for X(2120) in - BESIII Collaboration
2020
Using a sample of events collected with the BESIII detector, we perform a study of . X (2370) is observed in the invariant-mass distribution with a statistical significance of . Its resonance parameters are measured to be and . The product branching fractions for and are determined to be and , respectively. No evident signal for X (2120) is observed in the invariant-mass distribution. The upper limits for the product branching fractions of and are determined to be and at the 90% confidence level, respectively.
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