Measurement of the forward-backward charge asymmetry of electron-positron pairs inp¯pcollisions ats=1.96 TeV

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Abstract

We present a measurement of the mass dependence of the forward-backward charge asymmetry (${A}_{FB}$) for ${e}^{+}{e}^{\ensuremath{-}}$ pairs produced via an intermediate $Z/{\ensuremath{\gamma}}^{*}$ with mass ${M}_{ee}>40\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}/{c}^{2}$. We study the constraints on the $Z$-quark couplings imposed by our measurement. We analyze an integrated luminosity of $72\text{ }\text{ }{\mathrm{p}\mathrm{b}}^{\ensuremath{-}1}$ collected by the CDF-II detector in $\overline{p}p$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{T}\mathrm{e}\mathrm{V}$ at the Fermilab Tevatron. A comparison of the uncorrected ${A}_{FB}$ between data and standard model Monte Carlo gives good agreement with a ${\ensuremath{\chi}}^{2}/\mathrm{D}\mathrm{O}\mathrm{F}$ of 15.7/15. The couplings measurements are also consistent with standard model predictions.

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