1205.2730 (D. Gomez Dumm et al.)

Form factors of radiative pion decays in nonlocal chiral quark models    [PDF]

D. Gomez Dumm, S. Noguera, N. N. Scoccola

We study the radiative pion decay pi+ -> e+ nu_e gamma within nonlocal chiral quark models that include wave function renormalization. In this framework we analyze the momentum dependence of the vector form factor F_V(q^2), and the slope of the axial-vector form factor F_A(q^2) 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 l_5 and l_6, comparing our results with the values obtained in chiral perturbation theory.

View original: http://arxiv.org/abs/1205.2730