Quark sea effect on static properties of hadron

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6210609

Borhan, H

We study the effect of the quark sea on static properties of hadrons, within the framework of QCD. A QCD Hamiltonian density is used to obtain the quark amplitudes and probability in the lowest-order perturbation theory. The numerical results are obtained by using MIT bag model wavefunctions. A large excitation parameter for sea quark is found. The expectation values for the axial charge g/sub A/, the proton magnetic moment ..mu../sub p/, the proton mean-square radius /sub p/, and the mean-square radius of the axial charge are obtained. Calculations have been done up to the second order of the coupling constant ..cap alpha../sub c/ = g/sup 2//(4..pi..). The results are found to be in rough agreement with experiment for g/sub A/ and /sub p/. The calculated values for ..mu../sub p/ and are found to be smaller than the empirical values by 25%. Employing an approximate Hamiltonian matrix, the wavefunctions and operator matrix elements are then calculated exactly. This modifies the excitation parameters for sea quarks. But the renormalized results for four calculated properties remain roughly the same.

• Research Organization: California Univ., Los Angeles (USA)
• OSTI ID: 6210609
• Country of Publication: United States
• Language: English

Related Subjects

645201* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- General & Scattering Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BAG MODEL
BARYONS
CHARGE DENSITY
COMPOSITE MODELS
ELEMENTARY PARTICLES
EXPECTATION VALUE
EXTENDED PARTICLE MODEL
FERMIONS
FIELD THEORIES
HADRONS
MAGNETIC MOMENTS
MATHEMATICAL MODELS
NUCLEONS
PARTICLE MODELS
PARTICLE PROPERTIES
POSTULATED PARTICLES
PROTONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARK MODEL
QUARKS
RENORMALIZATION