Precision measurement of the weak mixing angle in Moller scattering

Journal Article · Wed May 04 00:00:00 EDT 2005 · Phys.Rev.Lett.95:081601,2005

DOI:https://doi.org/10.1103/PhysRevLett.95.081601· OSTI ID:890917

Anthony, P L; Arnold, R G; Arroyo, C; Bega, K; Biesiada, J; Bosted, P E; Bower, G; Cahoon, J; Carr, R; Cates, G D; Chen, J-P; Chudakov, E; Cooke, M; Decowski, P; Deur, A; Emam, W; Erickson, R; Fieguth, T; Field, C; Gao, J ; Gary, M

We report on a precision measurement of the parity-violating asymmetry in fixed target electron-electron (Moeller) scattering: A{sub PV} = (-131 {+-} 14 (stat.) {+-} 10 (syst.)) x 10{sup -9}, leading to the determination of the weak mixing angle sin{sup 2} {theta}{sub W}{sup eff} = 0.2397 {+-} 0.0010 (stat.) {+-} 0.0008 (syst.), evaluated at Q{sup 2} = 0.026 GeV{sup 2}. Combining this result with the measurements of sin{sup 2} {theta}{sub W}{sup eff} at the Z{sup 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.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 890917
• Report Number(s): SLAC-PUB-11149; hep-ex/0504049; TRN: US0604758
• Journal Information: Phys.Rev.Lett.95:081601,2005, Journal Name: Phys.Rev.Lett.95:081601,2005
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
MOELLER SCATTERING
ASYMMETRY
P INVARIANCE
WEAK INTERACTIONS
MIXING RATIO
Experiment-HEP