Abstract
An enhancement near the mass threshold is observed in the combined and invariant-mass spectrum from decays. It can be fit with an -wave Breit-Wigner resonance with a mass and a width of ; it can also be fit with a -wave Breit-Wigner resonance. Evidence for a similar enhancement is also observed in decays. The analysis is based on samples of and decays accumulated in the BES II detector at the Beijing Electron-Positron Collider.
- Received 19 May 2004
DOI:https://doi.org/10.1103/PhysRevLett.93.112002
©2004 American Physical Society