Old and new physics in nucleon spin structure

Technical Report · Tue Jan 01 00:00:00 EST 1991

DOI:https://doi.org/10.2172/6049120· OSTI ID:6049120

Lipkin, H J ^[1]

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1. Weizmann Inst. of Science, Rehovoth (Israel). Dept of Physics Washington Univ., Seattle, WA (United States). Inst. for Nuclear Theory

EMC implies quarks carry very little of the proton spin. (G{sub A}/G{sub V}){sub n{yields}p} implies that valence quarks carry 70% of the spin, but disagrees with SU(6). (G{sub A}/G{sub V}){sub {Sigma}{minus}{yields}n} agrees strinkingly with SU(6). All semileptonic decay data can be fit by SU(3), but no model fits the data by breaking SU(6) without also breaking SU(3). Considerable data on hadron masses and magnetic moments are fit by a simple constituent quark model with only constituent quarks. A toy model for the proton with valence quarks and sea fits nearly everything.

• Research Organization: Washington Univ., Seattle, WA (United States). Inst. for Nuclear Theory
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG06-90ER40561
• OSTI ID: 6049120
• Report Number(s): DOE/ER/40561-30; ON: DE92004385
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
NUCLEONS
SPIN
MAGNETIC MOMENTS
MASS
QUARK MODEL
QUARKS
SEMILEPTONIC DECAY
STRUCTURE FUNCTIONS
SU-3 GROUPS
SU-6 GROUPS
WAVE FUNCTIONS
ANGULAR MOMENTUM
BARYONS
COMPOSITE MODELS
DECAY
ELEMENTARY PARTICLES
FERMIONS
FUNCTIONS
HADRONS
LIE GROUPS
MATHEMATICAL MODELS
PARTICLE DECAY
PARTICLE MODELS
PARTICLE PROPERTIES
POSTULATED PARTICLES
SU GROUPS
SYMMETRY GROUPS
WEAK PARTICLE DECAY
662410* - Properties of Baryons & Baryon Resonances- (1992-)