https://doi.org/10.1140/epja/i2013-13008-9
Regular Article - Theoretical Physics
Effects of a spin-flavour-dependent interaction on light-flavoured baryon helicity amplitudes
Helmholtz Institute für Strahlen- und Kernphysik (Theorie), Universität Bonn, Nußallee 14-16, D-53115, Bonn, Germany
* e-mail: ronniger@hiskp.uni-bonn.de
Received:
27
June
2012
Revised:
11
December
2012
Accepted:
15
December
2012
Published online:
21
January
2013
This paper is a continuation of a previous work about the effects of a phenomenological flavour-dependent force in a relativistically covariant constituent quark model based on the Salpeter equation on the structure of light-flavoured baryon resonances. Here the longitudinal and transverse helicity amplitudes as studied experimentally in the electro-excitation of nucleon- and Δ-resonances are calculated. In particular the amplitudes for the excitation of three- and four-star resonances as calculated in a previous model A are compared to those of the novel model C as well as to existing and partially new experimental data such as, e.g., determined by the CB-ELSA Collaboration. A brief discussion on some improvements to model C is given after the introduction.
© SIF, Springer-Verlag Berlin Heidelberg, 2013
