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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
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 π0γ*γ decays are discussed.
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