What Do We Know About the Strange Magnetic Radius?

Details What Do We Know About the Strange Magnetic Radius? What Do We Know About the Strange Magnetic Radius?

2002-06-28

arxiv.org/abs/hep-ph/0206301v1

Phys.Lett. B562 (2003) 208-214

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, Revtex, 2 ps figures

Scientific paper

10.1016/S0370-2693(03)00604-X

We analyze the q^2-dependence of the strange magnetic form factor, \GMS(q^2), using heavy baryon chiral perturbation theory (HBChPT) and dispersion relations. We find that in HBChPT a significant cancellation occurs between the O(p^2) and O(p^3) loop contributions. Consequently, the slope of \GMS at the origin displays an enhanced sensitivity to an unknown O(p^3) low-energy constant. Using dispersion theory, we estimate the magnitude of this constant, show that it may have a natural size, and conclude that the low-q^2 behavior of \GMS could be dominated by nonperturbative physics. We also discuss the implications for the interpretation of parity-violating electron scattering measurements used to measure \GMS(q^2).

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