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arxiv: 1408.5016 · v2 · pith:VPM76W2Ynew · submitted 2014-08-21 · ✦ hep-ex

Measurement of the effective weak mixing angle in pbar{p}rightarrow Z/γ^(*)rightarrow e⁺e⁻ events

classification ✦ hep-ex
keywords rightarrowanglemeasurementmixingweakeffectiveeventsgamma
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We present a measurement of the fundamental parameter of the standard model, the weak mixing angle, in $p\bar{p}\rightarrow Z/\gamma^{*}\rightarrow e^{+}e^{-}$ events at a center of mass energy of 1.96 TeV, using data corresponding to 9.7 fb$^{-1}$ of integrated luminosity collected by the D0 detector at the Fermilab Tevatron. The effective weak mixing angle is extracted from the forward-backward charge asymmetry as a function of the invariant mass around the Z boson pole. The measured value of $\sin^2\theta_{\text{eff}}^{\text{$\ell$}}=0.23147 \pm 0.00047$ is the most precise measurement from light quark interactions to date, with a precision close to the best LEP and SLD results.

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