Light pseudoscalar mesons in a nonlocal SU(3) chiral quark model

ALBERTO SCARPETTINI; DANIEL GOMEZ DUMM; NORBERTO N. SCOCCOLA

PHYSICAL REVIEW D - PARTICLE AND FILDS

The American Physical Society

Lugar: Ridge, N. Y., EE. UU.; Año: 2004 vol. 69 p. 114018 - 114018

0556-2821

We study the properties of the light pseudoscalar mesons in a three-flavor chiral quark model with nonlocal separable interactions. We concentrate on the evaluation of meson masses and decay constants, considering both the cases of Gaussian and Lorentzian nonlocal regulators. The results are found to be in quite good agreement with the empirical values, in particular in the case of the ratio  fK / fpi  and the anomalous decay pi0 -> gamma gamma. In addition, the model leads to a reasonable description of the observed phenomenology in the eta - eta´ sector, even though it implies the existence of two significantly different state mixing angles.