The strangeness content of the proton: A theoretical investigation

The authors investigate the strangeness content of the proton, both in the cloudy bag model and in a hybrid of a naive nonrelativistic quark model and the Chew-Low model. Nucleonic matrix elements involving strange quarks are generated in these models from the contribution of the kaonic cloud. By using SU(6) for the mesonic couplings and by fitting the bag radius so that they reproduce the standard nucleonic observables, i.e. the magnetic moments and the charge radii, the authors are able to give theoretical predictions for F2, the strange quark contribution to the magnetic moments, for r2, the strangeness radius of the nucleon, and for Δs, the strangeness axial vector matrix element