Eur. Phys. J. C (2004) 37: 433-436
https://doi.org/10.1140/epjc/s2004-02031-0The phase of the
https://doi.org/10.1140/epjc/s2004-02031-0
experimental physics
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
