Single top-quark production with the ATLAS detector in pp collisions at sqrt(s)=7TeV

TL;DR

This paper reports measurements of single top-quark production cross sections at the LHC using ATLAS data, including the first limit on Wt associated production, advancing understanding of electroweak top-quark processes.

Contribution

First measurement of t-channel single top-quark production cross section and first limit on Wt associated production at 7 TeV with ATLAS data.

Findings

Measured t-channel cross section as 76 +41 -21 pb.

Set 95% CL upper limit on Wt production at 158 pb.

Analyzed data from 2010 and 2011 to study electroweak top production.

Abstract

The ATLAS experiment at the LHC at CERN has analyzed 2010 and 2011 data looking for electroweak production of single top quarks in the lepton+jets and di-lepton final states. The production cross section for the t-channel process is measured to be 76 +41 -21 pb using 156 pb^-1 of 2011 data. A first limit is set on the Wt associated production process using lepton+jets and di-lepton events. The 95% CL upper limit on the Wt production cross section is 158 pb using 35 pb^-1 of 2010 data.