artículo con referato
"Pion radiative weak decays in nonlocal chiral quark models"
D. Gómez Dumm, S. Noguera and N.N. Scoccola
Phys. Lett. B 698 (2011) 236-242
Abstract
We analyze the radiative pion decay π+ → e+νeγ within nonlocal chiral quark models that include wave function renormalization. In this framework we calculate the vector and axial-vector form factors FV and FA at q2=0 - where q2 is the e+νe squared invariant mass - and the slope a of FV(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 FV and a with the form factor in π0 → γ*γ decays are discussed.
DEPARTAMENTO FISICA TEORICA