Semileptonic decays of $\rho$, $\omega$, $\phi$, $\eta$ and $\eta'$ mesons in ground and first radially excited states in the $U(3)\times U(3)$ NJL model

In the extended $U(3)\times U(3)$ NJL model, semileptonic decays of $\rho$, $\omega$, $\phi$, $\eta$ and $\eta'$ mesons in both the ground and first radially excited states are described. Quark loops of the anomalous type are considered, which are based on the vertex $\eta \to VV$. The obtained results are in satisfactory agreement with the existing experimental data. In addition, a number of predictions for experimentally unmeasured decays of radially excited mesons are presented.

M.K. Volkov, K. Nurlan · 2022