Electromagnetic, axial-vector, and strange currents in the Skyrme model: Effects of symmetry breaking
- 1 February 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 43 (3), 869-884
- https://doi.org/10.1103/physrevd.43.869
Abstract
We further discuss a recently proposed approach to treating the SU(3) Skyrme model which led to good predictions for the baryon mass splittings. The baryon matrix elements of vector and axialvector currents are studied in great detail. It is found that the spin-½ baryon magnetic moments and the various ratios of hyperon decays approximately obey the SU(3)-symmetry relations. This fact only emerges after taking into account some very complicated and previously neglected terms. This result is remarkable in the sense that the baryon wave functions in the model differ appreciably from SU(3) symmetry. On the other hand, there are important deviations from SU(3) invariance for matrix elements of strange currents in the nucleon. The latter are relevant for some experiments of great current interest and our predictions for them are presented and compared with other approaches.
Keywords
This publication has 28 references indexed in Scilit:
- Singlet axial-vector current and the "proton-spin" questionPhysical Review D, 1990
- Kaon excitation in the SU(3) Skyrme modelPhysical Review D, 1990
- Symmetry breaking and hyperon decays in the Skyrme modelPhysical Review D, 1990
- Improved limits on the weak, neutral, hadronic axial vector coupling constants from quasielastic scattering of polarized electronsNuclear Physics B, 1989
- Axial current matrix elements of the nucleon based on an exact diagonalization of the SU(3) skyrme model hamiltonianPhysics Letters B, 1989
- Neutron-proton mass-splitting puzzle in Skyrme and chiral quark modelsPhysical Review D, 1989
- Chiral symmetry and the spin of the protonPhysics Letters B, 1988
- A measurement of the spin asymmetry and determination of the structure function g1 in deep inelastic muon-proton scatteringPhysics Letters B, 1988
- A new approach to the SU(3) Skyrme modelNuclear Physics B, 1988
- Unitary Symmetry and Leptonic DecaysPhysical Review Letters, 1963