arXiv subjects
Publications and source records attributed to Volkov M. K..
The branching fractions of $τ\to π^+ π^-π^- ν_τ$ and $τ\to π^- 2π^0ν_τ$ are calculated within the chiral NJL model. Features of the axial-vector $a_1$ meson which plays an important role in describing the $τ$ decays are discussed. Permissible values for the mass and width of the $a_1$ meson are considered in accordance with the latest experiments.
The branching fractions of the decays $τ^- \to K^- π^+ π^- ν_τ$, $τ^- \to K^- π^0 π^0 ν_τ$ and $τ^- \to \bar{K}^0 π^- π^0ν_τ$ are calculated in the $U(3)\times U(3)$ Nambu--Jona-Lasinio type chiral model. Four intermediate channels are considered: the contact channel and the channels with the intermediate axial vector, vector and pseudoscalar mesons. The additional resonance states $K^* π$ and $K ρ$ are taken into account in all channels. It is shown that the main contributions to the widths of these decays are given by the axial vector channel. In the axial vector channel, the intermediate resonances $K_1(1270)$ and $K_1(1400)$ are taken into account. The obtained results are in satisfactory agreement with the known experimental data.