Exotic high-isospin baryons in the Skyrme model: Experimental observable or large- N artifact

Journal Article · Wed May 01 04:00:00 EDT 1991 · Physical Review, D (Particles Fields); (USA)

DOI:https://doi.org/10.1103/PhysRevD.43.3089· OSTI ID:5592502

Cohen, T D; Griegel, D K ^[1]

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1. Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742 (USA)

The Skyrme model and other models based on hedgehog intrinsic states predict a band of exotic baryon resonances with {ital I}={ital J}=5/2 and higher. We discuss whether these states are artifacts of the implicit large-{ital N} physics of the Skyrme model, and estimate the production cross section and width of the lowest lying of these resonances (with {ital I}={ital J}=5/2), which we denote the {Gamma} baryon. Although the cross section is sufficiently large to be experimentally observed, the resonance, to leading order in 1/{ital N}, is much too wide to separate from the background. We discuss the breakdown of the 1/{ital N} expansion for these states, and suggest that the width is very sensitive to sub-leading-order 1/{ital N} effects, which could decrease the width sufficiently to make the {Gamma} baryon observable.

• DOE Contract Number: FG05-87ER40322
• OSTI ID: 5592502
• Journal Information: Physical Review, D (Particles Fields); (USA), Journal Name: Physical Review, D (Particles Fields); (USA) Vol. 43:9; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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645204* -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions & Properties
645400 -- High Energy Physics-- Field Theory
657002 -- Theoretical & Mathematical Physics-- Classical & Quantum Mechanics
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR MOMENTUM
BARYONS
COMPOSITE MODELS
COUPLING CONSTANTS
CROSS SECTIONS
EIGENSTATES
ELEMENTARY PARTICLES
EXOTIC RESONANCES
FERMIONS
FIELD THEORIES
HADRONS
HAMILTONIANS
ISOSPIN
MATHEMATICAL MODELS
MATHEMATICAL OPERATORS
MEAN-FIELD THEORY
NUCLEON-NUCLEON POTENTIAL
PARTICLE MODELS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
POTENTIALS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUANTUM OPERATORS
QUARK MODEL
QUASI PARTICLES
RESONANCE PARTICLES
SEMICLASSICAL APPROXIMATION
SKYRME POTENTIAL
SOLITONS