Abstract
SLAC E158 is an experiment to measure the parity nonconserving asymmetry in Moller scattering. Longitudinally polarized 48 GeV electrons are scattered off unpolarized (atomic) electrons in a liquid hydrogen target with an average Q2 of 0.027 GeV2. The asymmetry in this process is proportional to (14 − sin2 θW), where sin2 θW gives the weak mixing angle. The preliminary results give APV = −151.9 ± 29.0(stat) ± 32.5(syst) parts per billion. This in turn gives sin2 θWeff = 0.2371 ± 0.0025 ± 0.0027, which is consistant with the standard model prediction (0.2386 ± 0.0006).
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