Precision measurement of the weak mixing angle in Møller scattering

P L Anthony; R G Arnold; C Arroyo; K Bega; J Biesiada; P E Bosted; G Bower; J Cahoon; R Carr; G D Cates; J-P Chen; E Chudakov; M Cooke; P Decowski; A Deur; W Emam; R Erickson; T Fieguth; C Field; J Gao; M Gary; K Gustafsson; R S Hicks; R Holmes; E W Hughes; T B Humensky; G M Jones; L J Kaufman; L Keller; Yu G Kolomensky; K S Kumar; P LaViolette; D Lhuillier; R M Lombard-Nelsen; Z Marshall; P Mastromarino; R D McKeown; R Michaels; J Niedziela; M Olson; K D Paschke; G A Peterson; R Pitthan; D Relyea; S E Rock; O Saxton; J Singh; P A Souder; Z M Szalata; J Turner; B Tweedie; A Vacheret; D Walz; T Weber; J Weisend; M Woods; I Younus; SLAC E158 Collaboration

doi:10.1103/PhysRevLett.95.081601

Precision measurement of the weak mixing angle in Møller scattering

Phys Rev Lett. 2005 Aug 19;95(8):081601. doi: 10.1103/PhysRevLett.95.081601. Epub 2005 Aug 17.

Affiliation

¹ Stanford Linear Accelerator Center, Menlo Park, California 94025, USA.

PMID: 16196849
DOI: 10.1103/PhysRevLett.95.081601

Abstract

We report on a precision measurement of the parity-violating asymmetry in fixed target electron-electron (Møller) scattering: A(PV) = [-131 +/- 14(stat) +/- 10(syst)] x 10(-9), leading to the determination of the weak mixing angle sin2(thetaW(eff) = 0.2397 +/- 0.0010(stat) +/- 0.0008(syst), evaluated at Q2 = 0.026 GeV2. Combining this result with the measurements of sin2(thetaW(eff) at the Z0 pole, the running of the weak mixing angle is observed with over 6sigma significance. The measurement sets constraints on new physics effects at the TeV scale.