N* electroproduction amplitudes in a model with dynamical confinement

• Autor(a) principal: Alberto, P.
• Data de Publicação: 2001
• Outros Autores: Fiolhais, M., Golli, B., Marques, J.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10316/4504; https://doi.org/10.1016/S0370-2693(01)01348-X

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 [pi]- and [sigma]-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 [sigma]-meson vibrations is estimated; although small for N(1440), the [sigma] contribution can be large for N(1710).