In this work, the mixing angle of the vector $ω (782)$ $ω (782)$ and $ϕ (1020)$ $ϕ (1020)$ mesons is estimated in the framework of Nambu–Jona-Lasinio model. The decay $ϕ \to π^{0} γ$ $ϕ \to π^{0} γ$ is considered as a basic process to determine this angle. The obtained value is compared with the results of the other authors. Besides, the width of the decay $ϕ \to 3 π$ $ϕ \to 3 π$ and the cross-section of the process $e^{+} e^{-} \to π^{0} ϕ$ $e^{+} e^{-} \to π^{0} ϕ$ are calculated by using this angle.

Keywords:

PACS: 12.39.Fe, 13.25.Jx, 13.66.Bc, 13.75.Lb

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