IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
eta-gamma and eta'-gamma transition form factors in a nonlocal NJL model
Autor/es:
DANIEL GOMEZ DUMM; SANTIAGO NOGUERA; NORBERTO N. SCOCCOLA
Revista:
PHYSICAL REVIEW D
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2017 vol. 95 p. 54006 - 54006
ISSN:
1550-7998
Resumen:
We study the eta and eta' distribution amplitudes (DAs) in the context of a nonlocal SU(3)L x SU(3)R chiral quark model. The corresponding Lagrangian allows us to reproduce the phenomenological values of pseudoscalar meson masses and decay constants, as well as the momentum dependence of the quark propagator arising from lattice calculations. It is found that the obtained DAs have two symmetric maxima, which arise from new contributions generated by the nonlocal character of the interactions. These DAs are then applied to the calculation of the eta-gamma and eta'-gamma transition form factors. Implications of ourresults regarding higher twist corrections and/or contributions to the transition form factors originated by gluon-gluon components in the eta and eta' mesons are discussed.