Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-03-15
Phys.Lett. B523 (2001) 273-279
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 6 figures, uses elsevier macros
Scientific paper
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 $A_{1/2}$ and scalar $S_{1/2}$ 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).
Alberto Pedro
Fiolhais Manuel
Golli Bojan
Marques Joao
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