Seminar “Hadron Physics”

Date and Time: Friday, 17 March 2023, at 11:00 AM

Venue: online seminar on Zoom, Blokhintsev hall (4th floor), Bogoliubov Laboratory of Theoretical Physics

Link to join the seminar on Zoom

Seminar topic: “Description of the decays τ → Kππν_τ in U(3) x U(3) NJL chiral quark model”

Speaker: A. A. Pivovarov

Abstract:

The branching fractions of the decays τ⁻ → K⁻π⁺π⁻ν_τ’ τ⁻ → K⁻π⁰π⁰ν_τ and τ⁻ → K⁰π⁻π⁰ν_τ are calculated in the Nambu–Jona-Lasinio U(3) × U(3) 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^∗ and 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 K₁(1270) and K₁(1400) are taken into account. The obtained results are in satisfactory agreement with the known experimental data.