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arXiv · hep-ph/0206301

What Do We Know About the Strange Magnetic Radius?

H. -W. Hammer·S. J. Puglia·M. J. Ramsey-Musolf·Shi-Lin Zhu
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Abstract

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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H. -W. Hammer, S. J. Puglia, M. J. Ramsey-Musolf, Shi-Lin Zhu. 2002-06-28. What Do We Know About the Strange Magnetic Radius?. https://doi.org/10.1016/s0370-2693(03)00604-x

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