Precision Measurement of the Weak Mixing Angle in Moeller Scattering

Journal Article · Fri Aug 19 00:00:00 EDT 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.95.081601· OSTI ID:20699316

Anthony, P L; Bower, G; Erickson, R; Fieguth, T; Field, C; Keller, L; Olson, M; Pitthan, R; Saxton, O; Szalata, Z M; Turner, J; Walz, D; Weber, T; Weisend, J; Woods, M ^[1]; Arnold, R G; Arroyo, C; Cahoon, J; Hicks, R S; Kaufman, L J ^[2]

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1. Stanford Linear Accelerator Center, Menlo Park, California 94025 (United States)
2. University of Massachusetts, Amherst, Massachusetts 01003 (United States); and others

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)]x10{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.

• OSTI ID: 20699316
• Journal Information: Physical Review Letters, Vol. 95, Issue 8; Other Information: DOI: 10.1103/PhysRevLett.95.081601; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). SLAC E158 Collaboration; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
ELECTRON DIFFRACTION
ELECTRON-ELECTRON COLLISIONS
ELECTRON-ELECTRON INTERACTIONS
ELECTRONS
MOELLER SCATTERING
P INVARIANCE
PARITY
STANDARD MODEL
TEV RANGE 01-10
WEINBERG ANGLE