We report on a precision measurement of the parity-violating asymmetry in fixed target electron-electron (Møller) scattering: APV=[- 131±14(stat)±10(syst)]×10-9, leading to the determination of the weak mixing angle sin 2θWeff=0.2397±0.0010(stat)±0. 0008(syst), evaluated at Q2=0.026GeV2. Combining this result with the measurements of sin 2θWeff at the Z0 pole, the running of the weak mixing angle is observed with over 6σ significance. The measurement sets constraints on new physics effects at the TeV scale.
ASJC Scopus subject areas
- Physics and Astronomy(all)