The shell model approach: Key to hadron structure

Conference · Mon Aug 14 04:00:00 EDT 1989

OSTI ID:5396501

Lipkin, H J ^[1]

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1. Weizmann Inst. of Science, Rehovoth (Israel). Dept. of Nuclear Physics

A shell model approach leads to a simple constituent quark model for hadron structure in which mesons and baryons consist only of constituent quarks. Hadron masses are the sums of the constituent quark effective masses and a hyperfine interaction inversely proportional to the product of these same masses. Hadron masses and magnetic moments are related by the assumption that the same effective mass parameter appears in the additive mass term, the hyperfine interaction, and the quark magnetic moment, both in mesons and baryons. The analysis pinpoints the physical assumptions needed for each relation and gives two new mass relations. Application to weak decays and recent polarized EMC data confirms conclusions previously obtained that the current quark contribution to the spin structure of the proton vanishes, but without need for the questionable assumption of SU(3) symmetry relating hyperon decays and proton structure. SU(3) symmetry breaking is clarified. 24 refs.

• Research Organization: Argonne National Lab., IL (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5396501
• Report Number(s): ANL-HEP-CP-89-87; CONF-890583--4; ON: DE90002212
• Country of Publication: United States
• Language: English

Related Subjects

645204* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
COMPOSITE MODELS
EFFECTIVE MASS
ELEMENTARY PARTICLES
FERMIONS
HADRONS
HYPERFINE STRUCTURE
HYPERONS
LIE GROUPS
MAGNETIC MOMENTS
MASS
MATHEMATICAL MODELS
NUCLEAR MODELS
PARTICLE MODELS
QUARK MODEL
SHELL MODELS
STRANGE PARTICLES
SU GROUPS
SU-3 GROUPS
SYMMETRY BREAKING
SYMMETRY GROUPS