TOP-12-019
Measurement of missing transverse energy in top pair events

Abstract

A differential cross section measurement of top quark pair production with missing transverse energy is presented using 5.1 fb−1 of data collected using the CMS detector at the LHC at a centre of mass energy of 7 TeV. The analysis selects events with a single isolated high energy electron or muon, which is assumed to come from one of the W bosons produced in the decays of the top quark and antiquark. The differential cross section is measured in bins of missing transverse energy. The results are consistent with the predictions of simulation.

Figures

Figure Caption
Kinematic variable distributions seen in the event samples after all cuts. Points with error bars are the 2011 data, stacked histograms are the Monte Carlo expectations, the grey error bars are the uncertainty on the top quark pair cross section. Left Plots: muon+jets; right plots: electron+jets. Top: lepton abs(η); bottom: missing transverse energy.
MuPlusJets_muon_AbsEta_fit_central_0-25_2orMoreBtags.pngEPlusJets_electron_AbsEta_fit_central_0-25_2orMoreBtags.pngMuPlusJets_muon_AbsEta_fit_central_25-45_2orMoreBtags.pngEPlusJets_electron_AbsEta_fit_central_25-45_2orMoreBtags.pngMuPlusJets_muon_AbsEta_fit_central_45-70_2orMoreBtags.pngEPlusJets_electron_AbsEta_fit_central_45-70_2orMoreBtags.pngMuPlusJets_muon_AbsEta_fit_central_70-100_2orMoreBtags.pngEPlusJets_electron_AbsEta_fit_central_70-100_2orMoreBtags.pngMuPlusJets_muon_AbsEta_fit_central_100-inf_2orMoreBtags.pngEPlusJets_electron_AbsEta_fit_central_100-inf_2orMoreBtags.png Distributions of abs(η) for the muon+jets (left) and electron+jets (right) event samples (data points with error bars), with the results of the template fit (stacked histograms). The distributions are shown in bins of missing transverse energy, increasing from top to bottom.
AllChannels_diff_MET_norm_xsection_unfolded_2orMoreBtags.png Comparison between the individual and the combined results for the normalised differential cross section. The inner error bars indicate the statistical uncertainty, the outer error bars are the combined statistical and systematic uncertainty.
Combination_diff_MET_norm_xsection_compareSystematics_unfolded_2orMoreBtags.pngCombination_diff_MET_norm_xsection_unfolded_2orMoreBtags.png Comparison of normalised differential cross section result to matching threshold and Q2 scale up and down samples (left) and different generators (right) for the combination of both channels. The inner error bars indicate the statistical uncertainty, the outer error bars are the combined statistical and systematic uncertainty.

Supplementary Material

Supplementary material not contained within the PAS can be found here: https://twiki.cern.ch/twiki/bin/view/CMS/PasTop12019SupplementaryMaterial

-- PhilipSymonds - 15-Sep-2012

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