Precision Measurement of the Weak Mixing Angle in Moller Scattering

Details Precision Measurement of the Weak Mixing Angle in Moller Scattering Precision Measurement of the Weak Mixing Angle in Moller Scattering

2005-04-26

arxiv.org/abs/hep-ex/0504049v1

Phys.Rev.Lett.95:081601,2005

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 2 postscript figues, submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.95.081601

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 Z^0 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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