Quark masses in the extended Fock space approach from analysis of magneticmoments - art. no. 014027.

The effective masses of the quarks in an extended Fock space approach is ex tracted from an analysis of the magnetic moment of the baryons. Careful att ention is given to the L=1 term in the three-quark plus quark-antiquark sta tes, inclusion of gluons is essential for reproducing the correct magnetic moment ratio of the proton and neutron. The hyperspherical harmonics method is employed to handle the five-body wave functions. The effective masses o f the quarks in this approach are considerably smaller than those used in c onventional quark models, but greater than those of the current quarks. Mor eover, the contributions of the quark masses to the nucleon mass, obtained in this work, agrees well with those of the experimental observations and t hose of the chiral expansion model. [S0556-2821(98)04121-6].