Parity violating electron scattering: Measurements of parity
violation in elastic electron scattering from C and quasi-elastic
scattering from Be have been performed. They were sensitive to quite
different Standard Model couplings: the axial-electron/isoscalar-hadron for
carbon and the vector-electron/isovector-hadron in Be. Systematic effects
were controlled below 1 ppm in both experiments. Interpreted as
, the results were:
(carbon) and (Be), in good agreement with other
determinations.