Baryon magnetic moments in a simultaneous expansion in 1/N and ms.

We consider the baryon octet and decuplet magnetic moments in a simultaneous expansion in ms and 1/N taking NF /N ∼ 1, where N is the number of QCD colors and NF is the number of light quark flavors. At leading order in this expansion, the magnetic moments obey the non-relativistic quark-model relations. We compute corrections to these relations using an effective lagrangian formalism which respects chiral symmetry to all orders in the 1/N expansion. Including corrections up to order m 1/2 s , we find 8 relations among the 9 measured octet and decuplet magnetic moments; including corrections up to order 1/N and ms, we find 4 remaining relations. The relations work well, and suggest that the expansion is under control. We give predictions for the unmeasured decuplet magnetic moments. ∗ DOE distinguished postdoctoral research fellow. † SSC Fellow. This work was supported by the Director, Office of Energy Research, Office of High Energy and Nuclear Physics, Division of High Energy Physics of the U.S. Department of Energy under Contract DE-AC03-76SF00098.