Abstract
This document reviews the existing results of inclusive top quark pair production cross section measurements in proton-proton collisions at a center of mass energies of 7 and 8 TeV performed with the ATLAS detector at the Large Hadron Collider. These measurements cover the different analysis channels, single lepton, dilepton and all hadronic channel, as well as dedicated analysis for channels including tau leptons decaying hadronically. All measurements shown in this document are in good agreement with the Standard Model expectation.
Highlights
The Large Hadron Collider followed by a dataset of 20(fLbH−1Ca)t[1√] sha=s delivered 8 TeV in a dataset of fb−1 at √ s = TeV in2012
These two datasets have allowed the ATLAS experiment [2] to collect a large sample of top quark pairs, providing the opportunity to perform precision measurements of the inclusive ttcross section
These measurements are useful as a benchmark for QCD perturbative calculations, which are available at full NNLO [3, 4]: σ7ttTeV = 172.0+−45..48(scale)+−42..78(pdf) pb σ8ttTeV = 245.8+−68..24(scale)+−66..24(pdf) pb
Summary
The cross section is extracted from a χ2 fit of BDT j OS-SS templates built for signal ttevents (with real taus and electrons failing the tau-electron veto) and a background template. This background template is obtained from a data sample with all the selection requirements expect b-tagging and requiring in addition zero b-jets.
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