Measurement of the cross section for top-quark pair production in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector using final states with two high-pt leptons

TL;DR

This paper reports a measurement of the top-quark pair production cross section in proton-proton collisions at 7 TeV using the ATLAS detector, focusing on final states with two high-pt leptons, and provides a precise value with uncertainties.

Contribution

First measurement of the top-quark pair production cross section at 7 TeV with the ATLAS detector using dilepton final states.

Findings

Measured cross section: 176 pb with uncertainties.

Used 0.70 fb^-1 of data from LHC.

Results consistent with Standard Model predictions.

Abstract

A measurement is reported of the production cross section of top-quark pairs in proton-proton collisions at a center-of-mass energy of 7 TeV recorded with the ATLAS detector at the LHC. Candidate events have a signature consistent with containing two isolated leptons, large missing transverse momentum, and at least two jets. Using a data sample corresponding to an integrated luminosity of 0.70 fb^-1, a t-tbar production cross section sigmattbar=176 +/-5 (stat) +14 -11 (syst) +/- 8 (lum.) pb is measured for an assumed top-quark mass of m_t = 172.5 GeV.