Precise measurement of the weak mixing angle from leptonic polarization asymmetries at the SLD experiment

Direct Measurement of Leptonic Coupling Asymmetries with Polarized Z's * the Sld Collaboration

We present direct measurements of the Z 0-lepton coupling asymmetry parameters, A e , A µ , and A τ , based on a data sample of 12,063 leptonic Z 0 decays collected by the SLD detector. The Z bosons are produced in collisions of beams of polarized e − with unpolarized e + at the SLAC Linear Collider. The couplings are extracted from the measurement of the left-right and forward-backward asymmet...

An Ultra-precise Measurement of the Weak Mixing Angle using Møller Scattering

We propose to measure the parity-violating asymmetry APV in the scattering of longitudinally polarized 11 GeV electrons from the atomic electrons in a liquid hydrogen target (Møller scattering). In the Standard Model, APV is due to the interference between the electromagnetic amplitude and the weak neutral current amplitude, the latter being mediated by the Z boson. APV is predicted to be 35.6 ...

Precise measurement of the weak mixing angle in neutrino-nucleon scattering.

The Weak Mixing Angle at Low Energies

We determine the weak mixing angle in the MS-scheme, sin θ̂W (μ), at energy scales μ relevant for present and future low energy electroweak measurements. We relate the renormalization group evolution of sin θ̂W (μ) to the corresponding evolution of α̂(μ) and include higher-order terms in αs and α that had not been treated in previous analyses. We also up-date the analysis of non-perturbative, hadr...

A New Measurement of the Weak Mixing Angle

The E158 experiment at SLAC has made the first measurement of parity violation in electron-electron (Møller) scattering. We report a preliminary result using 50% of the accumulated data sample for the right-left parity-violating cross-section asymmetry (APV ) in the elastic scattering of 45 and 48 GeV polarized electron beams with unpolarized electrons in a liquid hydrogen target. We find APV =...