Quark model description of the N-N system: Momentum distributions, structure functions, and the EMC effect.
چکیده
We employ a relativistic quark bag picture, the chromo-dielectric soliton model, to discuss the quarks’ symmetry structure and momentum distribution in the N -N system. Six-quark clusters are constructed in a constrained mean-field calculation. The corresponding Hamiltonian contains not only an effective interaction between the quarks and a scalar field, which is assumed to parameterize all non-perturbative effects due to the non-linearity of QCD, but also quark-quark interactions mediated through one-gluon-exchange. We also evaluate the quark light-cone distribution functions, characterizing inclusive deep-inelastic lepton scattering, for the nucleon as well as for the six-quark 1 structures. We find a competition between a softening of the quarks’ momenta through the increase of the confinement volume, and a hardening via the admixture of higher symmetry configurations due to the color-electrostatic one-gluon-exchange. These findings suggest an unexpected absence of manynucleon, multi-quark effects, even though six-quark structures should represent a non-negligible part of the nuclear ground state. PACS number(s): 24.85.+p, 25.30.Fj, 12.39.Ba Typeset using REVTEX 2