A determination of electroweak parameters from Z0→μ+μ-(γ)

We have measured the partial width and forward-backward charge asymmetry for the reaction e+e- → Z0 → μ+μ-(γ). We obtain a partial width Γμμ of 83.3±1.3(stat)±0.9(sys) MeV and the following values for the vector and axial vector couplings: gV=-0.062(+0.020-0.015) and gA=-0.497(+0.005-0.005). From our measurement of the partial width and the mass of the Z0 boson we determine the effective electroweak mixing angle, sin2anti(θ)w=0.232±0.005, and the neutral current coupling strength parameter, ρ=0.998±0.016. (orig.)