G.R. Bower

Precision measurement of the weak mixing angle in Møller scattering

We report on a precision measurement of the parity-violating asymmetry in fixed target electron-electron (Møller) scattering: A(PV) = [-131 +/- 14(stat) +/- 10(syst)] x 10(-9), leading to the determination of the weak mixing angle sin2(thetaW(eff) = 0.2397 +/- 0.0010(stat) +/- 0.0008(syst), evaluated at Q2 = 0.026 GeV2. Combining this result with the measurements of sin2(thetaW(eff) at the Z0 pole, the running of the weak mixing angle is observed with over 6sigma significance. The measurement sets constraints on new physics effects at the TeV scale.

Measurement of [alpha][sub [ital s]] from energy-energy correlations at the [ital Z][sup 0] resonance

We determine the strong coupling [alpha][sub [ital s]] from a comprehensive study of energy-energy correlations (EECs) and their asymmetry (AEECs) in hadronic decays of [ital Z][sup 0] bosons collected by the SLD experiment at SLAC. The data are compared with all four available predictions of QCD calculated up to [ital O]([alpha][sub [ital s]][sup 2]) in perturbation theory, and also with a resummed calculation matched to all four of these calculations. We find large discrepancies between [alpha][sub [ital s]] values extracted from the different [ital O]([alpha][sub [ital s]][sup 2]) calculations. We also find a large renormalization scale ambiguity in [alpha][sub [ital s]] determined from the EECs using the [ital O]([alpha][sub [ital s]][sup 2]) calculations; this ambiguity is reduced in the case of the AEECs and is very small when the matched calculations are used. Averaging over all calculations, and over the EEC and AEEC results, we obtain [alpha][sub [ital s]]([ital M][sub [ital Z]][sup 2])=0.124[sub [minus]0.004][sup +0.003] (expt.) [plus minus]0.009 (theory).

Measurement of the charged multiplicity of [ital Z][sup 0][r arrow][ital b[bar b]] events

Using an impact parameter tag to select an enriched sample of

Measurement of the charged multiplicity of Z0-->bb-bar events.

Z \rightarrow b \overline{b}

Measuring the Higgs boson's parity using τ→ρν

events, we have measured the difference between the average charged multiplicity of

Undulator-Based Production of Polarized Positrons

Z \rightarrow b \overline{b}

Undulator-Based Production of Polarized Positrons, A Proposal for the 50-GeV Beam in the FFTB

and

Measurement of [alpha][sub [ital s]] from jet rates at the [ital Z][sup 0] resonance

Z^0 \rightarrow hadrons

Improved direct measurement of Ab and Ac at the Z0 pole using a lepton tag

to be

MEASUREMENTS OF THE CHARGED MULTIPLICITY OF Z0BB EVENTS

\overline{n}_{b} - \overline{n}_{had} = 2.24\pm 0.30(\rm{stat.}) \pm 0.33(\rm{syst.})