Precision Measurement of the Weak Mixing Angle in Moeller Scattering
Journal Article
·
· Physical Review Letters
- Stanford Linear Accelerator Center, Menlo Park, California 94025 (United States)
- 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, Journal Name: Physical Review Letters Journal Issue: 8 Vol. 95; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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