The use of pion N Delta gauge couplings in elastic ðN scattering

A. MARIANO; C. BARBERO; D. BADAGNANI

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS

IOP PUBLISHING LTD

Lugar: Londres; Año: 2012 vol. 39 p. 1 - 11

0954-3899

We perform a phenomenological analysis on the use of ðNDelta (1232) alternative couplings in ðN 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 nomeans 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.ðNDelta (1232) alternative couplings in ðN 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 nomeans 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.