Bethe-Salpeter qqq dynamics: Electromagnetic properties of baryons

Journal Article · Sun Apr 01 04:00:00 EST 1984 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.29.1399· OSTI ID:7186577

Mitra, A N; Mittal, A

The Bethe-Salpeter model for qq-bar and qqq systems under harmonic confinement, previously found to fit the qq-bar and qqq mass spectra of light (u,d,s) quarks rather well with a universal spring constant (omega-tilde = 0.15 GeV) and the concerned quark mass (m/sub u/d = 0.28 GeV, m/sub s/ = 0.35 GeV) is employed to predict some crucial electromagnetic properties of baryons as a generalization of a similar method recently developed for the electromagnetic interaction of qq-bar mesons. The major successes, in which the relativistic features of the model have played a crucial role, are in respect of magnetic moments of baryons and the charge radius of the proton, all in very good agreement with experiment with no free parameters. In particular, ..mu../sub p/ = 2.796 (2.793) nuclear magnetons and /sup 1/2/ = 0.86 (0.87) fm. The helicity amplitudes A/sub 3/2/ and A/sub 1/2/ for ..delta -->..N..gamma.. also reveal an improved fit to data over previous quark-model calculations. The significance of these results is discussed in relation to contemporary confinement models.

• Research Organization: Department of Physics, University of Delhi, Delhi 110007, India
• OSTI ID: 7186577
• Journal Information: Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 29:7; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645202* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BAG MODEL
BARYONS
BASIC INTERACTIONS
BETHE-SALPETER EQUATION
COMPOSITE MODELS
ELECTROMAGNETIC FORM FACTORS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
EQUATIONS
EXTENDED PARTICLE MODEL
FERMIONS
FORM FACTORS
HADRONS
HELICITY
INTERACTIONS
MAGNETIC MOMENTS
MASS SPECTRA
MATHEMATICAL MODELS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
PARTICLE RADII
PROTONS
QUARK MODEL
QUARK-ANTIQUARK INTERACTIONS
SPECTRA