Parity Violation in DIS at 12 GeV at JLab

In 1978, Prescott et al. [1] showed that parity-violating could be observed in neutral currents by measuring the asymmetry APV = (σR − σL)(σR + σL) in the deep inelastic scattering (DIS) of polarized electrons from deuterium. By extending the kinematic range, the same group later published results that were able to exclude alternative theories to the Standard Model that were considered reasonable at the time. The key to the experiment is that DIS PVDIS is sensitive to both the axial-vector (vector) electron couplings C1u and C1d (C2u and C2d) quarks in the phenomenological Lagrangian