Roper Electroproduction Amplitudes in a Chiral Confinement Model

Details Roper Electroproduction Amplitudes in a Chiral Confinement Model Roper Electroproduction Amplitudes in a Chiral Confinement Model

2002-01-04

arxiv.org/abs/hep-ph/0201020v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 8 figures, uses World Scientific macros. Talk presented at EMI2001 in Osaka, Japan

Scientific paper

A description of the Roper using the chiral chromodielectric model is presented and the transverse $A_{1/2}$ and the scalar $S_{1/2}$ helicity amplitudes for the electromagnetic Nucleon--Roper transition are obtained for small and moderate $Q^2$. The sign of the amplitudes is correct but the model predictions underestimate the data at the photon point. Our results do not indicate a change of sign in any amplitudes up to $Q^2\sim1$ GeV$^2$. The contribution of the scalar meson excitations to the Roper electroproduction is taken into account but it turns out to be small in comparison with the quark contribution. However, it is argued that mesonic excitations may play a more prominent role in higher excited states.

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