The phase of the amplitude in
Queen Mary, University of London, E1 4NS, London, UK
* e-mail: D.Bugg@rl.ac.uk
The phase variation of the amplitude is accurately determined as a function of mass from BES II data for . The determination arises from interference with the strong amplitude. The observed phase variation agrees within errors with that in elastic scattering.
© Springer-Verlag, 2004