Measurement of sin^2θ_{eff}^{lept} and Z-light quark couplings using the forward-backward charge asymmetry in p\bar{p} -> Z/γ^{*} -> e^{+}e^{-} events with L=5.0 fb^{-1} at \sqrt{s}=1.96 TeV

Abstract

We measure the mass dependence of the forward-backward charge asymmetry in 157,553 $p\bar{p}\to Z/{\gamma }^{\ast }\to e^{+}{e}^{-}$ interactions, corresponding to 5.0 fb${}^{-1}$ of integrated luminosity collected by the D0 experiment at the Fermilab Tevatron Collider at $\sqrt{s}=1.96$ TeV. The effective weak mixing angle (${\sin }^2{\theta }_{eff}^{lept}$) from this process involving predominantly the first generation of quarks is extracted as ${\sin }^2{\theta }_{eff}^{lept}=0.2309\pm 0.0008(stat.)\pm 0.0006(syst.)$. We also present the most precise direct measurement of the vector and axial-vector couplings of $u$ and $d$ quarks to the $Z$ boson.

arXiv commentsubmitted to Phys. Rev. D, 14 pages, 9 figures

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