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19 April 2024

» pubmed » pmid16196849

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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 ; ;
Date:	19 Aug 2005
Journal:	Phys Rev Lett, 95 (8), 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.
Source:	PubMed, pmid16196849
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