Quark-meson coupling model for baryon wave functions and properties

Journal Article · Thu Feb 01 00:00:00 EST 1990 · Physical Review, D (Particles Fields); (USA)

DOI:https://doi.org/10.1103/PhysRevD.41.924· OSTI ID:6981713

Leonard, W J; Gerace, W J ^[1]

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1. Department of Physics and Astronomy, University of Massachusetts, Amherst, Massachusetts 01003 (US)

A scalar-isoscalar quark-meson interaction is used to mix fundamental pseudoscalar mesons directly into the wave functions of baryons. The parameters of the model are constrained using properties of the ground-state baryon spectrum, such as charge radii, strong decay widths, and the pion-nucleon coupling constant. Physical wave functions of the ground-state baryons are presented. With the physical wave functions, we calculate nucleon electric form factors and spin-(3/2) baryon quadrupole moments. The addition of mesons produces effects on baryon properties comparable to effects due to spatial excitations of quarks. Although missing from most calculations, kaons and {eta}'s are found to be as important as pions in the baryon spectrum. Including mesons in the physical wave functions of baryons leads to the existence of low-energy resonances consisting primarily of three quarks in the ground state surrounded by a meson field. Most of these resonances decouple from the common production channels, but seven are expected to be observable. An additional {ital N}(1/2{sup +}) resonance state is calculated to have a mass close to that of the Roper resonance but a {pi}{ital N} width much smaller. A {Delta}((3/2){sup +}) candidate state is calculated to have a mass and {pi}{ital N} width close to the experimental values for the {Delta}(1600).

• OSTI ID: 6981713
• Journal Information: Physical Review, D (Particles Fields); (USA), Vol. 41:3; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
WAVE FUNCTIONS
QUARK-HADRON INTERACTIONS
COUPLING CONSTANTS
FLAVOR MODEL
FORM FACTORS
HAMILTONIANS
MESONS
OPE MODEL
PION-NUCLEON INTERACTIONS
QUADRUPOLE MOMENTS
QUARK MODEL
QUARK-QUARK INTERACTIONS
SU-3 GROUPS
BOSON-EXCHANGE MODELS
BOSONS
COMPOSITE MODELS
ELEMENTARY PARTICLES
FERMIONS
FUNCTIONS
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
LIE GROUPS
MATHEMATICAL MODELS
MATHEMATICAL OPERATORS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
OBE MODEL
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
PERIPHERAL MODELS
QUANTUM OPERATORS
SU GROUPS
SYMMETRY GROUPS
645204* - High Energy Physics- Particle Interactions & Properties-Theoretical- Strong Interactions & Properties