Top Quark Production Measurements at ATLAS

TL;DR

This paper reports on top quark production measurements at ATLAS, including cross-sections in various channels and single top production, using data from the LHC to improve precision and set limits.

Contribution

It provides the first combined measurement of the ttbar cross-section in multiple channels and reports on single top production in the t-channel at the LHC.

Findings

Measured ttbar cross-section with 13% precision in lepton+jets channel

Set limits on all-hadronic decay channel cross-section

Achieved the most precise combined ttbar cross-section measurement at the time

Abstract

An overview of top quark production measurements using the ATLAS detector at the LHC is presented. Using 35 pb^-1 of data, we measured the ttbar cross-section in the lepton+jets channel to 13% precision and set limits on the cross-section for the all hadronic decay channel. The measurement in the dilepton channel was performed using 0.70 fb^-1 of data and was combined with the lepton+jets channel result for our most precise ttbar cross-section measurement of \sigma(ttbar+X) =176 +- 5(stat) +13 -10 (syst) +-7(lumi). Single top production was also measured in the t-channel using 0.70 fb^-1 of data.