Measurement of the effective weak mixing angle in $p\bar{p}\rightarrow Z/\gamma^{*}\rightarrow e^{+}e^{-}$ events

TL;DR

This paper reports a highly precise measurement of the effective weak mixing angle using proton-antiproton collision data at 1.96 TeV, analyzing electron-positron events to improve understanding of the electroweak interaction.

Contribution

It provides the most precise measurement of the weak mixing angle from light quark interactions to date, using data from the Fermilab Tevatron.

Findings

Measured value of sin^2θ_eff^l = 0.23147 ± 0.00047

Achieved precision comparable to LEP and SLD results

Utilized 9.7 fb^{-1} of data from the D0 detector

Abstract

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.