Parity Violating Electron Scattering and Strangeness in the Nucleon

Abstract

A measurement of the weak form factor of the proton allows a flavor separation of the strangeness contribution to the electromagnetic form factors. The weak form factor is accessed experimentally by the measurement of a parity violating (PV) asymmetry in the scattering of polarized electrons on unpolarized protons. An extended experimental program to measure these parity violating asymmetries has been performed and is going on at different accelerators. After the first round of experiments allowing a separation of the strangeness form factors GEs and GMs at a Q2‐value of 0.1 (GeV/c)2, new, preliminary results have been achieved at 0.23 (GeV/c)2.