Precision measurement of the weak mixing angle in Moller scattering
Journal Article
·
· Phys.Rev.Lett.95:081601,2005
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
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