Processes e+e− → π0(π0′) γ in extended NJL model
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The processes of electron-positron annihilation into π0γ and into π′(1300)γ are considered within an extended NJL model. The intermediate vector mesons ρ0, ωρ′(1450), and ω(1420) are taken into account. The latter two mesons are treated as the first radial excited states. They are incorporated into the NJL model by means of a polynomial form factor. Numerical predictions for the cross-sections of these processes are received for the center-of-mass energies below 2 GeV. Our results for the π0γ production are in agreement with experimental data obtained in the energy region 600–1020 MeV.