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Observation of Parity Nonconservation in Moller Scattering


We report a measurement of the parity-violating asymmetry in fixed target electron-electron (M$\o$ller) scattering: $A_{PV} = (-175\pm 30\ ({\rm stat.})\pm 20\ ({\rm syst.})) \times 10^{-9}$. This first direct observation of parity nonconservation in M$\o$ller scattering leads to a measurement of the electron's weak charge at low energy $Q_W^e=-0.053\pm 0.011$. This is consistent with the Standard Model expectation at the current level of precision: $\sin^2\theta_{\mathrm{W}}(M_{\rm{Z}})_{\overline{\rm{MS}}} = 0.2293\pm 0.0024\ \mathrm{(stat.)}\pm 0.0016\ \mathrm{(syst.) \pm 0.0006\ \mathrm{(theory)}}$.

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The present version of SLAC-PUB-10270 was revised May 2004 from the original version published at SLAC in January 2004

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