Measurement of the Forward-Backward Charge Asymmetry of Electron-Positron Pairs in Proton anti-Proton Collisions at s**(1/2)=1.96-TeV

TL;DR

This paper measures the forward-backward charge asymmetry of electron-positron pairs in proton-antiproton collisions at 1.96 TeV, providing insights into Z-quark couplings and testing Standard Model predictions.

Contribution

It presents the first detailed measurement of A_{FB} dependence on mass in proton-antiproton collisions at Tevatron energies, constraining Z-quark couplings.

Findings

Good agreement between data and Standard Model Monte Carlo.

Measured Z-quark couplings are consistent with Standard Model.

No significant deviation observed in A_{FB} from predictions.

Abstract

We present a measurement of the mass dependence of the forward-backward charge asymmetry (A_{FB}) for electron-positron pairs produced via an intermediate Z/gamma with mass Mee > 40 GeV/c**(2). We study the constraints on the Z-quark couplings imposed by our measurement. We analyze an integrated luminosity of 72 pb-1 collected by the CDF II detector in proton anti-proton collisions at s**(1/2) = 1.96 TeV at the Fermilab Tevatron. A comparison of the uncorrected A_{FB} between data and Standard Model Monte Carlo gives good agreement with a chi^2/DOF of 15.7/15. The couplings measurements are also consistent with Standard Model predictions.