N* electroproduction amplitudes in a model with dynamical confinement

الأصل · EN

The Roper resonance is described in a chiral version of the chromodielectric model as a cluster of three quarks in radial-orbital configuration (1s)²(2s)¹, surrounded by π and σ-meson clouds and by a chromodielectric field which assures quark dynamical confinement. Radial profiles for all fields are determined self-consistently for each baryon. Transverse A₁/₂ and scalar S₁/₂ helicity amplitudes for the nucleon-Roper transition are calculated. The contribution of glueball and σ-meson vibrations is estimated; although small for N(1440), the σ contribution can be large for N(1710).