Nuclearβdecay, atomic parity violation, and new physics

The determinations of $|V_{\mathrm{ud}}{|}^2$ with super-allowed Fermi $\beta$ decay in nuclei and of the weak charge of cesium in atomic parity violation deviate from the standard model predicitions by $2\sigma$ or more. In both cases, the standard model overpredicts the magnitudes of the relevant observables. I discuss the implications of these results for R-parity violating (RPV) extensions of the minimal supersymmetric standard model. I also explore the possible consequences for RPV supersymmetry of prospective future low-energy electroweak measurements.