Measurement of differential top-quark pair production cross sections in pp collisions at sqrt(s) = 7 TeV

TL;DR

This paper reports measurements of differential top-quark pair production cross sections at 7 TeV proton-proton collisions, comparing results with QCD predictions and finding no significant deviations from the Standard Model.

Contribution

First measurement of normalized differential top-quark pair production cross sections at 7 TeV in multiple decay channels with detailed kinematic analysis.

Findings

Results agree with perturbative QCD predictions up to NNLO

No significant deviations from the Standard Model observed

Provides detailed differential cross sections as functions of various kinematic variables

Abstract

Normalised differential top-quark pair production cross sections are measured in pp collisions at a centre-of-mass energy of 7 TeV at the LHC with the CMS detector using data recorded in 2011 corresponding to an integrated luminosity of 5.0 inverse femtobarns. The measurements are performed in the lepton+jets decay channels (e+jets and mu+jets) and the dilepton decay channels (oppositely charged ee, mu mu, and e mu). The t t-bar differential cross section is measured as a function of kinematic properties of the final-state charged leptons and jets associated to b quarks, as well as those of the top quarks and the t t-bar system. The data are compared with several predictions from perturbative QCD calculations up to approximate next-to-next-to-leading-order precision. No significant deviations from the standard model are observed.