Observation of Parity Nonconservation in Moller Scattering
Abstract
We report a measurement of the parity-violating asymmetry in fixed target electron-electron (Moller) scattering: APV = -175 +/- 30 (stat.) +/- 20 (syst.) parts per billion. This first direct observation of parity nonconservation in Moller scattering leads to a measurement of the electron's weak charge at low energy QeW = -0.053 +/- 0.011. This is consistent with the Standard Model expectation at the current level of precision: sin2θW(MZ)MSbar = 0.2293 +/- 0.0024 (stat.) +/- 0.0016 (syst.) +/- 0.0006 (theory).
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