INVESTIGADORES
MARIANO Alejandro Edgardo
artículos
Título:
The use of pion N Delta gauge couplings in elastic pion-N scattering
Autor/es:
A. MARIANO; C. BARBERO; D. BADAGNANI
Revista:
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
Editorial:
IOP PUBLISHING LTD
Referencias:
Lugar: Londres; Año: 2012 vol. 39 p. 1 - 11
ISSN:
0954-3899
Resumen:
We perform a phenomenological analysis on the use of pion-Nucleon- Delta(1232) alternative couplings in pion-nucleon scattering, within a single and well-controlled dynamical model. We compare numerical results for the elastic cross section obtained using the conventional couplings, already adopted in several reaction calculations, with those obtained with the so-called ´´spin-3/2 gauge-invariant´´ vertexes suggested recently. Confronting with experimental cross-sectional data in the region around the resonance, we see that these results are by no means equivalent and the differences between them cannot be eliminated by a readjustment of free parameters of the meson-exchange contributions. We find that the use of the conventional couplings leads to better fits.