$1\mathrm{/}{N}_c$ approximation and universality of vector mesons

In this work, we argue that the observed differences in the value of the vector coupling constant extracted from the decays $\rho \to \pi \pi$ ($g_{\rho} = 6.0$),$\rho\to l^+l^-$($g_{\rho} = 5.0 $)and$\omega\to l^+ l^-$($g_{\rho} = 5.7$),where$l=e,\mu $, are an indication of the important role played by the $1\mathrm{/}{N}_c$ corrections in the description of these processes. We show that an emission of a photon by charged meson loops in the $\rho^0, \omega,\phi\to\gamma$ transitions is a key process that allows to describe above vector meson decays into two leptons with a single value $g_{\rho }=6.0$. Our result supports the idea of universality of neutral vector mesons and clarifies the role of accounting of $1\mathrm{/}{N}_c$ corrections to its fulfilment.