Abstract
With a sample of events registered in the BESIII detector, is studied using two decay modes: and . The , which was previously observed by BESII, is confirmed with a statistical significance that is larger than . In addition, in the invariant-mass spectrum, the and the , are observed with statistical significances larger than and , respectively. For the , the angular distribution of the radiative photon is consistent with expectations for a pseudoscalar.
- Received 16 December 2010
DOI:https://doi.org/10.1103/PhysRevLett.106.072002
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