Nonstrange baryon properties from one-gluon exchange and linear confinement between quarks

Thesis/Dissertation · Sat Jan 01 04:00:00 EST 1983

OSTI ID:7185872

Kiefer, M L

A model of the quark structure of nonstrange baryons is presented. Quasi-quarks whose masses are roughly 1/3 the proton mass and which interact via one-gluon exchange and linear confining two-body potentials are used. The model is semirelativistic in that the quark kinetic energies and the one-gluon exchange potential include the lowest order, nonrelativistic terms plus the first order relativistic corrections. The three quark Hamiltonian is diagonalized in a harmonic oscillator basis using all states up to 6 omega of excitation energy. The basis states have the center of mass motion explicitly factored out and are overall antisymmetric in the combined variables of space, spin, isospin, and color. The four model parameters are fixed by fitting theoretical predictions to a small subset of experimental data. The resulting N and ..delta.. resonant mass spectrum encompasses all known j/sup ..pi../ levels and differs from experiment by an average of about 6%. The quark kinetic energies are consistent with the assumption that only the first order relativistic corrections are necessary. The predicted proton and neutron magnetic moments and the proton charge radius agree well with experiment, but the predicted neutron charge radius is too low in magnitude. Photon decay amplitudes are calculated for the transition from a resonant state to the N 1/2/sup +/ ground state using the nonrelativistic quark-photon decay operator. Reasonable agreement with experiment for these amplitudes was found. Hence, the model appears to correctly describe the basic quark interactions in nonstrange baryons.

• Research Organization: Iowa State Univ. of Science and Technology, Ames (USA)
• OSTI ID: 7185872
• Country of Publication: United States
• Language: English

Related Subjects

645201 -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- General & Scattering Theory
645400* -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BAG MODEL
BARYON RESONANCES
BARYONS
COMPOSITE MODELS
DATA
ELEMENTARY PARTICLES
EXCHANGE INTERACTIONS
EXTENDED PARTICLE MODEL
FERMIONS
HADRONS
HAMILTONIANS
INFORMATION
INTERACTIONS
MAGNETIC MOMENTS
MASS SPECTRA
MATHEMATICAL MODELS
MATHEMATICAL OPERATORS
N RESONANCES
NEUTRONS
NUCLEONS
NUMERICAL DATA
PARTICLE MODELS
PARTICLE PROPERTIES
PARTICLE RADII
PROTONS
QUANTUM OPERATORS
QUARK MODEL
RADIATIVE DECAY
RESONANCE PARTICLES
SPECTRA
THEORETICAL DATA