The decay $\tau \to K^{*0}(892) K^- \nu_{\tau}$ in the extended NJL model

In the extended Nambu -- Jona-Lasinio model, the decay width of $\tau \to K^{*0}(892) K^- \nu_{\tau}$ is calculated. The contributions from the contact diagram and diagrams with intermediate axial-vector, vector and pseudoscalar mesons in the ground and first radially excited states are taken into account. It is shown that axial-vector and vector channel with a contact diagram give a dominant contribution to the decay width. The obtained results for the decay width $\tau \to K^{*0}(892) K^- \nu_{\tau}$ are in satisfactory agreement with experimental data. A prediction for differential distribution over the invariant mass of the meson pair $K^{*0}(892) K^-$ is given.

M. K. Volkov, A. A. Pivovarov, K. Nurlan · 2019