First Results from E158 Measuring Parity Violation in Moller Scattering
Abstract
SLAC E158 is an experiment to measure the parity nonconserving asymmetry in Moller scattering. Longitudinally polarized 48 GeV electrons are scattered off unpolarized (atomic) electrons in a liquid hydrogen target with an average Q2 of 0.027 GeV2. The asymmetry in this process is proportional to (1/4 - sin2θW), where sin2 θW gives the weak mixing angle. The preliminary results give APV = -151.9 ± 29.0(stat) ± 32.5(syst) parts per billion. This in turn gives sin2θWeff = 0.2371 ± 0.0025 ± 0.0027, which is consistant with the standard model prediction (0.2386 ± 0.0006).
- Publication:
-
Neutrino Factories and Superbeams: 5th International Workshop on Neutrino Factories and Superbeams; NuFact 03
- Pub Date:
- October 2004
- DOI:
- 10.1063/1.1818436
- Bibcode:
- 2004AIPC..721..367Y
- Keywords:
-
- 13.66.De;
- 13.15.+g;
- 11.30.Er;
- Lepton production in e<sup>-</sup>e<sup>+</sup> interactions;
- Neutrino interactions;
- Charge conjugation parity time reversal and other discrete symmetries