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Published May 17, 2004 | Published
Journal Article Open

Observation of Parity Nonconservation in Møller Scattering


We report a measurement of the parity-violating asymmetry in fixed target electron-electron (Møller) scattering: A_(PV) = [-175 ± 30(stat)± 20(syst)] X 10^(-9). This first direct observation of parity nonconservation in Møller scattering leads to a measurement of the electron's weak charge at low energy Q^e_W = -0:053 ± 0:011. This is consistent with the standard model expectation at the current level of precision: sin^2θ_W = (M_Z)_(MS) = 0:2293 ± 0:0024(stat) ± 0:0016(syst) ± 0:0006(theory).

Additional Information

© 2004 The American Physical Society. Received 11 December 2003; published 7 May 2004. We thank the SLAC staff for their efforts in helping develop and operate the E158 apparatus, and especially A. Brachmann and T. Maruyama for their essential work on the polarized electron source. This work was supported by Department of Energy Contract No. DE-AC03-76SF00515, and by the Division of Nuclear Physics at the Department of Energy and the Nuclear Physics Division of the National Science Foundation in the United States and the Commissariat à l'Énergie Atomique and the Centre National de la Recherche Scientifique in France.

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