Meson production in $J\mathrm{/}\psi$ decays and $J\mathrm{/}\psi \to N\bar{N}\gamma$ process

It is shown that an account for the final-state interaction of real or virtual nucleon and antinucleon produced in the processes $J\mathrm{/}\psi \to p\bar{p}\gamma$, $\psi (2S)\to p\bar{p}\gamma$, $J\mathrm{/}\psi \to p\bar{p}\omega$, and $J\mathrm{/}\psi \to 3\left({\pi }^{+}{\pi }^{-}\right)\gamma$ near the threshold of $N\bar{N}$ pair production allows one to obtain self-consistent description of these processes. Predictions of our model are in good agreement with experimental data available. The proposed potential model also reproduces the corresponding partial cross sections of $p\bar{p}$ scattering.