Sea Contributions to Nucleon Structure in a Semirelativistic Constituent Quark Model
Abstract
The quark pair creation vertex operator derived from Dirac Hamiltonain is similar to the form used in the ^3P_0-model but parameter free. With the qbar q creation/annihilation terms in the hamiltonian the particle states no longer have a fixed number of quarks but include 'sea quarks' along with 'core' quarks. In an harmonic oscillator basis, we assume there is some optimal choice for the oscillator and mixing parameters to give a good rendering of ground and resonance baryon wavefunctions with an economical expansion which in our case is truncated at the sd ( n=0,2 ) shell. Including the sea quark structure in the baryons, we study the meson cloud contributions to one-body and two-body observables calculated for the ground states of nucleon. The nucleon form factor and magnetic moment as well as charge, mass, and magnetic radii will be investigated as they should provide good size constraints. Our preliminary studies show that the introduction of the sea quarks ( meson cloud ) should modify the conclusions considerably.
- Publication:
-
APS Meeting Abstracts
- Pub Date:
- May 1996
- Bibcode:
- 1996APS..MAY.J1519C