Top cross section measurements at ATLAS

TL;DR

This paper reports measurements of top-quark pair production cross sections at 7 TeV using ATLAS data, confirming consistency with Standard Model predictions.

Contribution

First measurement of top-quark pair production cross section at 7 TeV with detailed event selection and analysis.

Findings

Measured cross section: 180 ± 9 (stat) ± 15 (syst) ± 6 (lumi) pb

Results agree with Standard Model predictions

Analysis used single lepton and dilepton topologies

Abstract

Measurements of the production cross section of top-quark pairs ($t\bar t$) in $pp$ collisions at $\sqrt{s}$ = 7 TeV are presented using 35 \ipb\ of data recorded with the ATLAS detector at the Large Hadron Collider. Events are selected in the single lepton (electron or muon) and dilepton topologies with multi-jets, and large missing transverse energy. The result is $\sigma_{t\bar t} = 180 \pm 9\,\mathrm{(stat.)} \pm15 \,\mathrm{(syst.)} \pm 6 \,\mathrm{(lumi.)\,pb}$, which agrees with the Standard Model prediction.