STRANGE MAGNETISM IN THE NUCLEON

Using heavy baryon chiral perturbation theory to one loop, we derive a n analytic and parameter-free expression for the momentum dependence o f the strange magnetic form factor of the nucleon G(M)((s))(Q(2)) and its corresponding radius. This should be considered as a lower bound. We also derive a model-independent relation between the isoscalar magn etic and the strange magnetic form factors of the nucleon based on chi ral symmetry and SU(3) only. This gives an upper bound on the strange magnetic form factor. We use these limites to derive bounds on the str ange magnetic moment of the proton from the recent measurement of G(M) ((s))(Q(2) = 0.1 GeV2) by the SAMPLE collaboration. We further stress the relevance of this result for the on-going and future experimental programs at various electron machines. (C) 1998 Published by Elsevier Science B.V. All rights reserved.