Measurement of the phase between strong and electromagnetic amplitudes in the decay $J/\ddot{I}ˆ\to \ddot{I}•\hat{I}\cdot$

BESIII Collaboration, M. Ablikim, M. N. Achasov +652

The first direct measurement of the relative phase between the strong and electromagnetic amplitudes for a $J/\ddot{I}ˆ$ decaying into a vector-pseudoscalar final state is performed using…