Strange quark contributions to parity-violating asymmetries in the backward angle G0 electron scattering experiment

Abstract

The G0 collaboration has measured parity-violating asymmetries in elastic electron-proton and quasielastic electron-deuteron scattering at Q2 = 0.22 and 0.63 GeV2. They are sensitive to strange quark contributions to currents in the nucleon, and to the nucleon axial current. The results indicate strange quark contributions of < 10% of the charge and magnetic nucleon form factors at these four-momentum transfers. They also provide the first measurement of anapole momenteffects in the axial current at these four-momentum transfers. © 2010 American Institute of Physics.