Observation of Parity Nonconservation in Moller Scattering

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  • 10 December 2003
Abstract
We report a measurement of the parity-violating asymmetry in fixed target electron-electron (Moller) scattering: A_PV = -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 Q^e_W = -0.059 +/- 0.012. This is consistent with the Standard Model expectation at the current level of precision: sin^2\theta_W(M_Z)_MSbar = 0.2279 +/- 0.0026 (stat.) +/- 0.0018 (syst.) +/- 0.0006 (theory).

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