Ss¯sea pair contribution to electromagnetic observables of the proton in the unquenched quark model

Abstract

We present an unquenched quark model calculation of the $s\overline{s}$ sea pairs' contribution to the magnetic moment of the proton (the strange magnetic moment) and its charge radius (the strange radius). In our approach the effects of the $s\overline{s}$ pairs are taken explicitly into account through a microscopic, QCD-inspired, quark-antiquark pair creation mechanism. Our results for the two ``strangeness'' observables are compatible with the latest experimental results and recent lattice calculations.