Thursday, July 12, 2012

1207.2640 (Michael Ronniger et al.)

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

Michael Ronniger, Bernard Ch. Metsch
This paper is a continuation of 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 $\Delta$ resonances are calculated. In particular the amplitudes for the excitation of three and four star resonances as calculated in a previous model $\mathcal A$ are compared to those of the novel model $\mathcal C$ as well as to existing and partially new experimental data such as e.g. determined by the CB-ELSA collaboration. A brief discussion of some improvements to model $\mathcal C$ is given after the introduction.
View original: http://arxiv.org/abs/1207.2640

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