Measurement of sin2 θeff#ell# 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 √s = 1.96 TeV

We measure the mass dependence of the forward-backward charge asymmetry in 157,553 p(bar p) → Z/γ* → e+e- interactions, corresponding to 5.0 fb-1 of integrated luminosity collected by the D0 experiment at the Fermilab Tevatron Collider at √s = 1.96 TeV. The effective weak mixing angle (θeff#ell#) from this process involving predominantly the first generation of quarks is extracted as sin2 θeff#ell# = 0.2309 ± 0.0008 (stat.) ± 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.