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.
Categories: hep-ex