Pion radiative weak decays in nonlocal chiral quark models

作者：Gomez Dumm D; Noguera S; Scoccola N N

来源：Physics Letters B, 2011, 698(3): 236-242.

DOI：10.1016/j.physletb.2011.03.002

• Nonlocal quark models
• Pion radiative weak decays

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.

• 出版日期2011-4-11