Effects of a spin-flavour-dependent interaction on light-flavoured baryon helicity amplitudes

• Published in: The European physical journal. A, Hadrons and nuclei Vol. 49; no. 1
• Main Authors: Ronniger, Michael, Metsch, Bernard Ch
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 2013
• Subjects: Hadrons; Heavy Ions; Nuclear Fusion; Nuclear Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Regular Article - Theoretical Physics; Helicity Amplitude; Magnetic Form Factor; Form Factor; Transition Form Factor; Transverse Amplitude
• ISSN: 1434-6001; 1434-601X
• DOI: 10.1140/epja/i2013-13008-9

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.