Speaker
Igor Boyko
(JINR)
Description
The J/psi charmonium state can decay
to the same final states through either
strong or electromagnetic mechanism.
Theoretical models predict rather different
values of the relative phase difference
between the two amplitudes. The BESIII
experiment has performed an energy scan
of the process e+e- -> J/psi -> phi eta
in the vicinity of the J/psi peak.
In this talk we report the determination
of the phase difference between strong
and electromagnetic amplitudes from the
lineshape scan of the J/psi resonance.
Primary author
Igor Boyko
(JINR)
