Abstract
We report the observation of a narrow charmoniumlike state produced in the exclusive decay process . This state, which decays into , has a mass of , a value that is very near the mass threshold. The results are based on an analysis of 152M - events collected at the resonance in the Belle detector at the KEKB collider. The signal has a statistical significance that is in excess of .
- Received 8 September 2003
DOI:https://doi.org/10.1103/PhysRevLett.91.262001
©2003 American Physical Society