Measurement of W^+W^- production in pp collisions at sqrt{s}=7 TeV with the ATLAS detector and limits on anomalous WWZ and WWgamma couplings

TL;DR

This paper reports a measurement of W^+W^- production cross section at 7 TeV with the ATLAS detector, compares it to Standard Model predictions, and sets limits on anomalous gauge couplings using the transverse momentum distribution.

Contribution

First measurement of W^+W^- production cross section at 7 TeV with detailed limits on anomalous WWZ and WWgamma couplings using ATLAS data.

Findings

Measured W^+W^- cross section: 51.9 pb with uncertainties.

Compatible with Standard Model prediction of 44.7 pb.

Set limits on anomalous gauge couplings.

Abstract

This paper presents a measurement of the W^+W^- production cross section in pp collisions at sqrt{s}=7 TeV. The leptonic decay channels are analyzed using data corresponding to an integrated 4.6 fb-1 collected with the ATLAS detector at the Large Hadron Collider. The W^+W^- production cross section sigma(pp -> W^+W^-+X) is measured to be 51.9 +- 2.0 (stat) +- 3.9 (syst) +- 2.0 (lumi) pb, compatible with the Standard Model prediction of 44.7 +2.1 -1.9 pb. A measurement of the normalized fiducial cross section as a function of the leading lepton transverse momentum is also presented. The reconstructed transverse momentum distribution of the leading lepton is used to extract limits on anomalous WWZ and WWgamma couplings.