Measurements of top quark pair relative differential cross-sections with ATLAS in pp collisions at sqrt(s) = 7 TeV

TL;DR

This paper reports measurements of how top quark pair production varies with different kinematic variables at 7 TeV, using ATLAS data, and compares results to Standard Model predictions.

Contribution

First measurement of top quark pair differential cross-sections relative to the total at 7 TeV with detailed systematic analysis.

Findings

No significant deviations from Standard Model predictions.

Differential cross-sections measured with 10-20% uncertainties.

Results consistent with theoretical models.

Abstract

Measurements are presented of differential cross-sections for top quark pair production in pp collisions at sqrt(s) = 7 TeV relative to the total inclusive top quark pair production cross-section. A data sample of 2.05/fb recorded by the ATLAS detector at the Large Hadron Collider is used. Relative differential cross-sections are derived as a function of the invariant mass, the transverse momentum and the rapidity of the top quark pair system. Events are selected in the lepton (electron or muon) + jets channel. The background-subtracted differential distributions are corrected for detector effects, normalized to the total inclusive top quark pair production cross-section and compared to theoretical predictions. The measurement uncertainties range typically between 10% and 20% and are generally dominated by systematic effects. No significant deviations from the Standard Model expectations are observed.