Chiral color-dielectric model with perturbative quantum pions and gluons

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.47.1791· OSTI ID:6645060

Dodd, L R; Driscoll, D E ^[1]

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1. Department of Physics and Mathematical Physics, University of Adelaide, Adelaide, South Australia (Australia)

Pionic contributions to static nucleon properties are calculated in a chiral extension of the color-dielectric model. The pion field and residual gluon field are treated perturbatively. It is shown that with a simple choice for the energy of the scalar confining field and assuming the chiral limit, the system of equations describing the bare soliton and the perturbative pion and gluon fields may be cast in a dimensionless, parameter-free form for large glueball masses. This enables a formula for the masses of the nucleon and [Delta] including leading-order pionic and gluonic contributions and corrections for spurious center-of-mass motion, valid for a wide range of input parameters determining the bare-soliton solutions, to be derived. A further consequence of the scaling behavior is that pionic contributions to nucleon properties, calculated using the methods of the cloudy-bag model, are insensitive to the soliton parameters, once the size of the soliton is fixed. The model results are very similar to those of the cloudy-bag model but the predicted masses are about 20% too large, and the pionic contributions to charge radii are underestimated.

• OSTI ID: 6645060
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 47:4; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

662240* -- Models for Strong Interactions-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BAG MODEL
BARYONS
BOSONS
CHIRAL SYMMETRY
COLOR MODEL
COMPOSITE MODELS
CONFINEMENT
ELEMENTARY PARTICLES
EXTENDED PARTICLE MODEL
FERMIONS
GLUONS
GOLDBERGER-TREIMAN RELATION
HADRONS
MATHEMATICAL MODELS
MESONS
NUCLEONS
PARTICLE MODELS
PERTURBATION THEORY
PIONS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
QUARK MODEL
SCALING LAWS
SYMMETRY