The Strangeness Electric Form Factor of the Proton

By combining the constraints of charge symmetry with new chiral extrapolation techniques and recent low mass lattice QCD simulations of the individual quark contributions to the electric charge radii of the baryon octet we obtain an accurate determination of the strange electric charge radius of the proton. While this analysis provides a value for GEs(Q2 0.1 GeV2) in agreement with the best current data, the theoretical error is comparable with that expected from future HAPPEX results from JLab. Together with the earlier determination of GMs, this result considerably constrains the role of hidden flavor in the structure of the nucleon