## Dispersion analysis of the strange vector form factors of the nucleon

We analyze the nucleon matrix element of the strange quark vector current in a nucleon-model-independent dispersive approach with input from the current world data set for the isoscalar electromagnetic form factors. The update of Jaffe{close_quote}s minimal three-pole {ital Ansatz} for the spectral functions yields a 40{percent} larger (Sachs) strangeness radius (r{sub s}{sup 2}){sub Sachs}=0.20 fm{sup 2} and a by 20{percent} reduced magnitude of the strangeness magnetic moment {mu}{sub s}={minus}0.26. In the pole approximation these values are shown to be upper bounds. After extending the {ital Ansatz} in order to implement the asymptotic QCD momentum dependence (which the three-pole form factorsmore »