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Precision Measurement of the Weak Mixing Angle in Moller Scattering


We report on a precision measurement of the parity-violating asymmetry in fixed target electron-electron (Moller) scattering: A_PV = (-131 +/- 14 (stat.) +/- 10 (syst.)) parts per billion, leading to the determination of the weak mixing angle sin^2\theta_W^eff = 0.2397 +/- 0.0010 (stat.) +/- 0.0008 (syst.), evaluated at Q^2 = 0.026 GeV^2. Combining this result with the measurements of sin^2\theta_W^eff at the Z0 pole, the running of the weak mixing angle is observed with over 6 sigma significance. The measurement sets constraints on new physics effects at the TeV scale.

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