Abstract
We study neutral current couplings of leptons to polarized Z0's in the SLD experiment in terms of the leptonic asymmetry parameters Ae, Aμ and Aτ. We discuss in detail eL, R− + e+ → Z0 → μ− μ+ and τ− τ+, with left(L)- or right(R)-handed polarized electron beams. SLD's most precise measurement of Ae is shown to result from the left-right cross section asymmetry, ALR, where the dependence on initial state electronic couplings enable use of essentially all of the data. Comparing Aμ and Aτ, with Ae tests the universality of leptonic couplings. Aμ = 0.102 ± 0.033 ± 0.001, Aτ = 0.190 ± 0.034 ± 0.001, and Ae = 0.148 ± 0.016 ± 0.002 from these two leptonic channels. If lepton universality is assumed, a combined asymmetry parameter Aeμτ = 0.147 ± 0.013 results, which directly corresponds to an effective value of the weak mixing angle sin2 θWeff = 0.2315 ± 0.0017.
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