Measurement of the t t-bar production cross section in the dilepton channel in pp collisions at sqrt(s) = 7 TeV

TL;DR

This paper reports a measurement of the top-antitop quark pair production cross section in proton-proton collisions at 7 TeV using CMS data, confirming consistency with the Standard Model predictions.

Contribution

The paper presents a new measurement of the t t-bar production cross section in the dilepton channel at 7 TeV with improved precision using CMS data.

Findings

Measured cross section: 161.9 pb with uncertainties.

Results are consistent with Standard Model predictions.

Analysis used 2.3 fb^-1 of CMS data.

Abstract

The t t-bar production cross section (sigma[t t-bar]) is measured in proton-proton collisions at sqrt(s) = 7 TeV in data collected by the CMS experiment, corresponding to an integrated luminosity of 2.3 inverse femtobarns. The measurement is performed in events with two leptons (electrons or muons) in the final state, at least two jets identified as jets originating from b quarks, and the presence of an imbalance in transverse momentum. The measured value of sigma[t t-bar] for a top-quark mass of 172.5 GeV is 161.9 +/- 2.5 (stat.) +5.1/-5.0 (syst.) +/- 3.6(lumi.) pb, consistent with the prediction of the standard model.