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Pion radiative weak decays in nonlocal chiral quark models

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Pion radiative weak decays in nonlocal chiral quark models

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Gómez Dumm, Daniel; Noguera Puchol, Santiago; Scoccola, N.N.

Aquest document és un/a article, creat/da en: 2011

Este documento está disponible también en : 10.1016/j.physletb.2011.03.002

We analyze the radiative pion decay pi(+) -> e(+) nu(e)gamma 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 q(2) = 0 ¿ where q(2) is the e(+) nu(e) squared invariant mass ¿ and the slope a of F-V (q(2)) at q(2) -> 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 pi(0) -> gamma*gamma decays are discussed.

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