1205.3329 (M. K. Volkov et al.)

The decays $ρ^{-}\toηπ^{-}$ and
$τ^{-}\toη(η')π^{-}ν$ in the NJL model    [PDF]

M. K. Volkov, D. G. Kostunin

The widths of the decays $\rho^{-}\to\eta\pi^{-}$ and $\tau^{-}\to\eta(\eta')\pi^{-}\nu$ are calculated in the framework of the NJL model. It is shown that these decays are defined by the $u$ and $d$ quark mass difference. It leads to the suppression of these decays in comparison with the main decay modes. In the process $\rho^{-}\to\eta\pi^{-}$ the intermediate scalar $a_0^{-}$ state is taken into account. For the $\tau$ decays the intermediate states with $a_0^{-}$, $\rho^{-}(770)$ and $\rho^{-}(1450)$ mesons are used. Our estimates are compared with the results obtained in other works.

View original: http://arxiv.org/abs/1205.3329