Parity Violation Deep Inelastic Scattering Experiments at JLab

Abstract

We report on the measurement of parity-violating asymmetries in the nucleon resonance and deep inelastic scattering (DIS) regions for longitudinally polarized electrons scattered from unpolarized deuterons. The effective weak couplings, denoted by C 2q , are accessible through the measured inclusive DIS asymmetries. In these proceedings, we present a measurement of the parity-violating asymmetry, from which a determination of 2C 2u -C 2d with an improved precision of a factor of five relative to the previous result was achieved. This result indicates evidence with 95% confidence that the 2C 2u -C 2d is non-zero. This experiment also provides the first parity-violation data covering the full resonance region, which provides constraints on nucleon resonance models. Finally, the program to extend these measurements at Jefferson Lab in the 12 GeV era using the Solenoidal Large Intensity Device is also mentioned.