Baryon magnetic moments and the spin of the proton

Journal Article · Wed Jan 01 04:00:00 EST 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.45.247· OSTI ID:5136391

Karl, G ^[1]

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1. Department of Physics, University of Guelph, Guelph, Ontario, N1G 2W1 (Canada)

I derive a set of generalized Sehgal equations (GSE) which link octet-baryon magnetic moments to quark axial-vector currents in the proton. The equations are shown to be valid in a class of shell models, containing both nonrelativistic and relativistic quark models. The GSE fit magnetic-moment data better than naive quark model formulas, but not perfectly. In best fits to magnetic moments quarks carry a small fraction of the angular momentum of the proton. The precise value of this fraction is poorly determined by these fits: {Delta}{ital u}+{Delta}{ital d}+{Delta}{ital s}=0.27{plus minus}0.23; this fraction is small compared to unity, but consistent with the recent European Muon Collaboration experiments.

• OSTI ID: 5136391
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 45:1; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662110* -- General Theory of Particles & Fields-- Theory of Fields & Strings-- (1992-)
662120 -- General Theory of Particles & Fields-- Symmetry
Conservation Laws
Currents & Their Properties-- (1992-)
662410 -- Properties of Baryons & Baryon Resonances-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALGEBRAIC CURRENTS
ANGULAR MOMENTUM
AXIAL-VECTOR CURRENTS
BARYONS
COMPOSITE MODELS
CURRENTS
DECAY
ELEMENTARY PARTICLES
EMC EFFECT
FERMIONS
FIELD THEORIES
GENERAL RELATIVITY THEORY
HADRONS
MAGNETIC MOMENTS
MATHEMATICAL MODELS
NUCLEAR MODELS
NUCLEONS
PARTICLE DECAY
PARTICLE MODELS
PARTICLE PROPERTIES
POSTULATED PARTICLES
PROTONS
QUARK MODEL
QUARKS
RELATIVITY THEORY
SEMILEPTONIC DECAY
SHELL MODELS
SPIN
WEAK PARTICLE DECAY