Small contributions to baryon magnetic moments

Baryon magnetic moments are considered in the quark model. Small contributions to the moments are assumed to arise from configuration mixing (including configurations with orbital angular momentum) in the baryon wave functions, from SU(3) breaking, and from the dependence of the effective quark masses on their environment. It is found that these contributions can improve the agreement of the quark model with experiment. However, so long as quarks have Dirac magnetic moments, charge symmetry holds, and SU(3) breaking effects are small, there is a residual disagreement between predictions of the model and values of some of the recently measured hyperon magnetic moments. (orig.)