Observation of parity nonconservation in møller scattering

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

doi:10.1103/PhysRevLett.92.181602

Observation of parity nonconservation in møller scattering

Phys Rev Lett. 2004 May 7;92(18):181602. doi: 10.1103/PhysRevLett.92.181602. Epub 2004 May 7.

Authors

Affiliation

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

PMID: 15169482
DOI: 10.1103/PhysRevLett.92.181602

Abstract

We report a measurement of the parity-violating asymmetry in fixed target electron-electron (Møller) scattering: A(PV)=[-175+/-30(stat)+/-20(syst)] x 10(-9). This first direct observation of parity nonconservation in Møller scattering leads to a measurement of the electron's weak charge at low energy Q(e)(W)=-0.053+/-0.011. This is consistent with the standard model expectation at the current level of precision: sin((2)theta(W)(M(Z))((-)MS)=0.2293+/-0.0024(stat)+/-0.0016(syst)+/-0.0006(theory).