Strange magnetism in the nucleon

Details Strange magnetism in the nucleon Strange magnetism in the nucleon

1998-06-02

arxiv.org/abs/hep-ph/9806226v2

Phys.Lett. B437 (1998) 184-190

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pp, LaTeX, uses epsf, 3 figs, small modifications, relation to the results of ref.[7] clarified

Scientific paper

10.1016/S0370-2693(98)00889-2

Using heavy baryon chiral perturbation theory to one loop, we derive an analytic and parameter-free expression for the momentum dependence of 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 magnetic and the strange magnetic form factors of the nucleon based on chiral 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 strange magnetic moment of the proton from the recent measurement of $G_M^{(s)} (Q^2=0.1 GeV^2)$ by the SAMPLE collaboration. We stress the relevance of this result for the on-going and future experimental programs at various electron machines.

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