The leading nonzero electric moment of the nucleon strange-quark vector current is the mean square strangeness radius 〈rₛ²〉. We evaluate the lightest Okubo-Zweig-Iizuka--allowed contribution to 〈rₛ²〉, arising from the kaon cloud, using dispersion relations. Drawing upon unitarity constraints as well as K⁺N scattering and e⁺e^-→KK̄ cross section data, we find the structure of this contribution differs significantly from that suggested by a variety of QCD-inspired model calculations. In particular, we find evidence for a strong φ-meson resonance which may enhance the scale of kaon cloud contribution to an observable level.
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Ramsey-Musolf et al. (1998) studied this question.
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