Pion radiative weak decays in nonlocal chiral quark models

We analyze the radiative pion decay π⁺ →e⁺ν_e γ within nonlocal chiral quark models that include wave function renormalization. In this framework we calculate the vector and axial-vector form factors F_V and F_A at q² = 0 - where q² is the e⁺ν_e squared invariant mass - and the slope a of F_V (q²) at q² → 0. The calculations are carried out considering different nonlocal form factors, in particular those taken from lattice QCD evaluations, showing a reasonable agreement with the corresponding experimental data. The comparison of our results with those obtained in the (local) NJL model and the relation of F_V and a with the form factor in π⁰ →γ^* γ decays are discussed.