Final-state interaction phase difference in $J/\psi \to \rho \eta$ and $\omega \eta$ decays

N. N. Achasov, V. V. Gubin

It is shown that the study of the $\omega -{\rho }^0$ interference pattern in the $J/\psi \to ({\rho }^0+\omega )\eta \to {\pi }^{+}{\pi }^{-}\eta$ decay provides the evidence for the large (nearly $90^{\circ }$) relative phase betwe…