Top-quark pair cross-section measurement in the lepton+jets channel

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, employing a multivariate kinematic analysis without b-tagging.

Contribution

It introduces a novel approach to measure the top-quark pair cross-section using a multivariate method without relying on b-tagging techniques.

Findings

Measured cross-section value consistent with Standard Model predictions

Achieved a precise measurement using a simple multivariate analysis

Demonstrated effectiveness of non-b-tagging methods in top-quark studies

Abstract

A measurement of the production cross-section for top quark pairs in pp collisions at sqrt{s} = 7 TeV is presented using data recorded with the ATLAS detector. Events are selected in the lepton+jets topology by requiring a single lepton (electron or muon), large missing transverse energy and at least three jets. No explicit identification of secondary vertices inside jets (b-tagging) is performed. A simple multivariate method using three kinematic variables is employed to extract the cross-section measurement.