INVESTIGADORES
GOMEZ DUMM Daniel Alberto
artículos
Título:
Pion radiative weak decays in nonlocal chiral quark models
Autor/es:
DANIEL GOMEZ DUMM; SANTIAGO NOGUERA; NORBERTO N. SCOCCOLA
Revista:
PHYSICS LETTERS B
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2011 vol. 698 p. 236 - 242
ISSN:
0370-2693
Resumen:
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 FV and FA at q2 = 0 --- where q2 is the e+ nu_e 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 pi0 --> gamma* gamma decays are discussed.
