Probing supersymmetry with parity-violating electron scattering

We compute the one-loop supersymmetric (SUSY) contributions to the weak charges of the electron (Q_w^e), proton (Q_w ^p), and cesium nucleus (Q_w^Cs) in the minimal supersymmetric standard model (MSSM). Such contributions can generate several percent corrections to the corresponding standard model values. The magnitudes of the SUSY loop corrections to Q_w^e and Q_w ^p are correlated over nearly all of the MSSM parameter space and result in an increase in the magnitudes of these weak charges. In contrast, the effects on Q_w^Cs are considerably smaller and are equally likely to increase or decrease its magnitude. Allowing for R-parity violation can lead to opposite sign relative shifts in Q_w^e and Q_w^p normalized to the corresponding standard model values. A comparison of Q_w^p and Q_w^e measurements could help distinguish between different SUSY scenarios.