First measurement of the forward-backward charge asymmetry in top quark pair production

TL;DR

This paper reports the first measurement of the forward-backward charge asymmetry in top-antitop quark pair production at the Fermilab Tevatron, providing insights into top quark production dynamics and potential new physics.

Contribution

It introduces the first measurement of the integrated forward-backward charge asymmetry in top-antitop production in proton-antiproton collisions using the D0 detector data.

Findings

Measured asymmetry for different jet multiplicities.

Set upper limits on ttbar+X production via Z' resonance.

Demonstrated the feasibility of asymmetry measurement in this channel.

Abstract

We present the first measurement of the integrated forward-backward charge asymmetry in top-antitop quark pair (ttbar) production in proton-antiproton collisions in the lepton plus jets final state. Using a b-jet tagging algorithm and kinematic reconstruction assuming ttbar+X production and decay, a sample of 0.9fb-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 ttbar+X production via a Z' resonance.