SLAC Experiment E158: A Precision Measurement of the Weak Mixing Angle by Moller Scattering

SLAC Experiment E158 is a precision measurement of the weak mixing angle at low $Q^2$. The experiment is a mesurement of the left-right asymmetry ($A_{LR}$) in M{\o}ller scattering ($e^- e^-\rightarrow e^- e^-$) of polarized electrons off unpolarized electrons in a liquid Hydrogen target. E158 tests electroweak theory at the quantum loop level and is sensitive to new physics at the TeV scale. The experiment has recently been completed and results are now being released.