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The Strange Vector Form Factors

We discuss two descriptions of the nucleon's strange vector form factors in the framework of vector meson dominance. The first, an updated and extended version of Jaffe's dispersion analysis, approximates the spectral functions of the form factors as a sum of vector meson poles, whereas the second combines vector meson dominance in the ω and φ meson sector with an intrinsic strangeness distribution from a kaon cloud. The strangeness content of the nucleon, as probed by the matrix elements N|sΓs|N of strange quark operators s, ¯ s in a Lorentz channel specified by Γ, offers a key to intriguing and little understood quantum effects in the nucleon wave function. Due to the relatively small strange quark mass these effects can be sizable, and growing experimental evidence indeed indicates unexpectedly large amounts of strangeness in the nucleon. From pion-nucleon scattering data, for example, one can extract the ratio R s = p|ss|p p|uu + dd + ss|p (1) (u, d and s are the up, down and strange quark fields, and |p denotes the nucleon state), and obtains surprisingly large (although somewhat controversial) values, up to R s ≃ 0.1 − 0.2 (Cheng 1