Abstract
The mass and width of the lowest-lying -wave spin singlet charmonium state, the , are measured using a data sample of decays collected with the BESIII detector at the BEPCII storage ring. We use a model that incorporates full interference between the signal reaction, , and a nonresonant radiative background to describe the line shape of the successfully. We measure the mass to be and the total width to be , where the first errors are statistical and the second are systematic.
- Received 2 November 2011
DOI:https://doi.org/10.1103/PhysRevLett.108.222002
© 2012 American Physical Society