Form factors of radiative pion decays in nonlocal chiral quark models

الأصل · EN

We study the radiative pion decay pi+ -> e+ nuₑ gamma within nonlocal chiral quark models that include wave function renormalization. In this framework we analyze the momentum dependence of the vector form factor Fᵥ(q²), and the slope of the axial-vector form factor Fₐ(q²) at threshold. Our results are compared with available experimental information and with the predictions given by the NJL model. In addition we calculate the low energy constants l₅ and l₆, comparing our results with the values obtained in chiral perturbation theory.