The decays $\tau \rightarrow (\eta,\eta') K^{-} \nu_{\tau}$ in the extended Nambu-Jona-Lasinio model

Abstract

The decays $\tau \rightarrow (\eta,\eta') K^{-} \nu_{\tau}$ are described in the framework of the extended Nambu-Jona-Lasinio model. Both full and differential widths of these decays are calculated. The vector and scalar channels are considered. In the vector channels, the subprocesses with intermediate $K^{*}(892)$ and $K^{*}(1410)$ mesons play the main role. In the scalar channels, the subprocesses with intermediate $K_{0}^{*}(800)$ and $K_{0}^{*}(1430)$ mesons are taken into account. Scalar channels play a less important role in calculation of the full width of the decay $\tau \rightarrow (\eta,\eta') K^{-} \nu_{\tau}$. The obtained results are in satisfactory agreement with the experimental data.