Magnetic Moments of the Baryons
Abstract
The anomalous magnetic moments of the baryon octet are calculated in broken SU(3) symmetry using lowenergy pole dominance as a dynamical model and keeping only the lowest lying intermediate states, the psuedoscalarmesonbaryon states. By using dispersion theory, the anomalous moments are related to an energy integral over the S_{12} and P_{12} photomeson production amplitudes, which at low energy and for vanishing meson mass are exactly given by the pole terms. From this exact information we calculate the lowenergy contribution to the anomalous moments, keeping all orders in baryon and meson mass splittings and using the SU(3)symmetric strongcoupling constants. We are able to account for the dominant contribution to the proton and neutron magnetic moment and find in addition, for an FD ratio~0.6, that K(Λ)~0.4K(n), in agreement with the observed value. The SU(3) predictions for the other moments and the Σ^{0}>Λ+γ transition moment are found to be more badly violated.
 Publication:

Physical Review
 Pub Date:
 November 1965
 DOI:
 10.1103/PhysRev.140.B999
 Bibcode:
 1965PhRv..140..999P