A. Pivovarov

Decay widths of radially excited vector mesons of the $U (3)$ nonet with production of three pseudoscalar mesons in the extended NJL model

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

In the extended NJL model, the decays of the first radially excited vector mesons $ρ^{'}$ , $ω^{'}$ , $ϕ^{'}$ and $K^{*}^{'}$ with production of $3 P$ , where $P = K, π, η$ are calculated. The box chan…

Description of the process $e^{+} e^{-} \to π^{0} π^{0} γ$ in the extended NJL model

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

The cross section of the process $e^{+} e^{-} \to π^{0} π^{0} γ$ is calculated in the extended NJL quark model. The vector channel with the intermediate $ρ$ , $ω$ , $ρ^{'}$ and $ω^{'}$ mesons is co…

Two-body decays of radially excited $η (1295)$ and $η (1475)$ mesons in the extended NJL model

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

In the extended NJL model, two-body strong decays of the radially excited $η (1295)$ and $η (1475)$ mesons are described. It is shown that the two-body decays $η(1475)\to K_0^*K, a_0…

Chiral anomaly in the $η^{(')} \to π^{+} π^{-} γ$ and $η^{(')} \to π^{+} π^{-} l^{+} l^{-}$ decays

M. K. Volkov, A. A. Osipov, K. Nurlan +1

We report the presence of a flavor-violating correction to the $V AAA$ -type anomaly, $δ^{(')}$ , induced by the surface terms of the anomalous quark triangle diagram, previously…

hep-ph2025

Decays $f_{1} \to a_{0} π, π π π (η)$ and $f_{1} \to K K π$ in the chiral $U (3) \times U (3)$ quark NJL model

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

The branching fractions of the axial vector meson decays $f_{1} \to a_{0} π, π π η$ , $f_{1} \to ρ π, π π π$ and $f_{1} \to K K π$ are calculated in the standard $U (3) \times U (3)$ quark NJL model.…

hep-ph2025

Decays $τ \to π π η ν_{τ}$ and $τ \to π η η ν_{τ}$ in the extended Nambu-Jona-Lasinio model

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

In the framework of the extended Nambu-Jona-Lasinio model, the processes $τ \to π π η (η^{'}) ν_{τ}$ and $τ \to π η η (η^{'}) ν_{τ}$ are considered taking into account mesons in the ground and first r…

Decays $τ \to f_{0} (π, K) ν_{τ}$ and $τ \to 3 π ν_{τ}$ accounting for the contribution of $f_{0} (500)$

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

In the $U (3) \times U (3)$ quark NJL model, $τ$ lepton decays with the production of scalar mesons $f_{0} (π, K])$ and neutrinos are studied, where $f_{0} = f_{0} (500), f_{0} (980)$ . It is shown…

Weak semileptonic decays of vector mesons in the NJL model

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

The decay widths of $V \to K (π) l ν ˉ_{l}$ are calculated within the Nambu--Jona-Lasinio model, where $V = K^{*}, ρ, ω, ϕ$ and $l = μ, e$ . The results are obtained using the previously…

Description of the processes $e^{+} e^{-} \to π^{+} π^{-}$ and $τ^{-} \to π^{-} π^{0} ν_{τ}$ in the NJL model with value of the vector coupling constant $g_{ρ} = 6$

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

It is shown that the processes $e^{+} e^{-} \to π^{+} π^{-}$ and $τ^{-} \to π^{-} π^{0} ν_{τ}$ can be described in a unified approach in satisfactory agreement with experiment using the vector cou…

Description of the processes $e^{+} e^{-} \to K^{+} K^{-} π^{0}$ and $e^{+} e^{-} \to K^{+} K^{-} η$ within the extended NJL model

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

In the framework of the $U (3) \times U (3)$ extended Nambu-Jona-Lasinio model, the processes $e^{+} e^{-} \to K^{+} K^{-} π^{0}$ and $e^{+} e^{-} \to K^{+} K^{-} η$ are described taking into account both g…

Decays of radially excited vector mesons $ρ^{'}$ and $ω^{'}$ in the extended NJL model

M. K. Volkov, A. B. Arbuzov, A. A. Pivovarov +1

The decay widths of $ρ^{'} \to π π, ω π, ρ η$ , $ω^{'} \to ρ π, ω η$ and $π^{'} \to ρ π$ are recalculated within the extended NJL quark model. It is shown that the mass of $ρ^{'} (1450)$ meson in the…

The decays $τ \to [K^{-} K^{0} π^{0}, K^{-} K^{+} π^{-}, K^{0} K^{0} ˉ π^{-}] ν_{τ}$ in the NJL quark model

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

The $τ$ lepton decays $τ \to [K^{-} K^{0} π^{0}, K^{-} K^{+} π^{-}, K^{0} K^{0} ˉ π^{-}] ν_{τ}$ are described in the $U (3) \times U (3)$ NJL quark model. The contact channel and intermediate channe…

Three-meson $τ$ decays involving kaons and $η$ mesons in the NJL model

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

Branching fractions of decays $τ \to K^{0} π^{-} η ν_{τ}$ , $τ \to K^{-} π^{0} η ν_{τ}$ , $τ \to K^{-} K^{0} η ν_{τ}$ and $τ \to K^{-} η η ν_{τ}$ are calculated in the $U (3) \times U (3)$ chiral NJL quark model. The…