Measurement of the Forward-Backward Charge Asymmetry in Top-Quark Pair Production

We present the first measurement of the integrated forward-backward charge asymmetry in top-quark–top-antiquark pair ($t\overline{t}$) production in proton-antiproton ($p\overline{p}$) collisions in the $\mathrm{\text{lepton}}+\mathrm{\text{jets}}$ final state. Using a $b$-jet tagging algorithm and kinematic reconstruction assuming $t\overline{t}+X$ production and decay, a sample of $0.9{\mathrm{fb}}^{-1}$ of data, collected by the D0 experiment at the Fermilab Tevatron Collider, is used to measure the asymmetry for different jet multiplicities. The result is also used to set upper limits on $t\overline{t}+X$ production via a $Z^{\prime }$ resonance.