TOP-12-042
Measurement of missing transverse energy and other event-level observables in top pair events at sqrt(s) = 8 TeV

Abstract

Results of the normalised differential cross section measurements of top quark pair production with respect to a number of event-level observables are presented, including missing transverse energy, jet transverse momentum scalar sum, total event transverse momentum scalar sum, leptonic W transverse momentum, and leptonic W transverse mass. Approximately 20 fb−1 of data collected using the CMS detector at the LHC in 2012 at a centre-of-mass energy of 8 TeV are used. The analysis is performed for semileptonic ttbar events where the charged lepton is either an electron or a muon. Unfolding is performed such that the results can be compared with theoretical predictions at generator level. The results are consistent with Standard Model expectations.

Figures

Figure Caption
muon_bin_0-25.pngelectron_bin_0-25.png
muon_bin_150-inf.pngelectron_bin_150-inf.pdf
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: 0-25 GeV (top), ≥ 150 GeV (bottom). Signal includes both ttbar and single-top and the rest of the backgrounds are combined.


Distributions of the primary variables in the electron+jets channel after the final event selection. The simulated signal and backgrounds are normalised to the results of the fits summed over all bins for each variable. The plots are of HT (top left), ST (top right), MTW (middle left), pTW (middle right) and missing transverse energy (bottom).


Distributions of the primary variables in the muon+jets channel after the final event selection. The simulated signal and backgrounds are normalised to the results of the fits summed over all bins for each variable. The plots are of HT (top left), ST (top right), MTW (middle left), pTW (middle right) and missing transverse energy (bottom).


The normalised semi-leptonic ttbar differential cross section with respect to variables under study, from top to bottom: missing transverse energy, HT, ST, pTW, MTW. The data are compared to theoretical predictions showing the variation in predictions due to modelling uncertainties (left) and the predictions of three different generators (right).

-- SergeySenkin - 10 Sep 2013

Topic attachments
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PDFpdf EPlusJets_HT_2orMoreBtags.pdf r2 r1 manage 88.8 K 2013-09-10 - 15:43 SergeySenkin Distributions of the primary variables
PNGpng EPlusJets_HT_2orMoreBtags.png r2 r1 manage 179.7 K 2013-09-10 - 15:43 SergeySenkin Distributions of the primary variables
PDFpdf EPlusJets_patType1CorrectedPFMet_2orMoreBtags.pdf r2 r1 manage 117.4 K 2013-09-10 - 15:43 SergeySenkin Distributions of the primary variables
PNGpng EPlusJets_patType1CorrectedPFMet_2orMoreBtags.png r2 r1 manage 170.0 K 2013-09-10 - 15:43 SergeySenkin Distributions of the primary variables
PDFpdf EPlusJets_patType1CorrectedPFMet_MT_2orMoreBtags.pdf r2 r1 manage 94.4 K 2013-09-10 - 15:44 SergeySenkin Distributions of the primary variables
PNGpng EPlusJets_patType1CorrectedPFMet_MT_2orMoreBtags.png r2 r1 manage 167.2 K 2013-09-10 - 15:44 SergeySenkin Distributions of the primary variables
PDFpdf EPlusJets_patType1CorrectedPFMet_ST_2orMoreBtags.pdf r2 r1 manage 92.6 K 2013-09-10 - 15:44 SergeySenkin Distributions of the primary variables
PNGpng EPlusJets_patType1CorrectedPFMet_ST_2orMoreBtags.png r2 r1 manage 179.9 K 2013-09-10 - 15:44 SergeySenkin Distributions of the primary variables
PDFpdf EPlusJets_patType1CorrectedPFMet_WPT_2orMoreBtags.pdf r2 r1 manage 75.3 K 2013-09-10 - 15:45 SergeySenkin Distributions of the primary variables
PNGpng EPlusJets_patType1CorrectedPFMet_WPT_2orMoreBtags.png r2 r1 manage 169.2 K 2013-09-10 - 15:45 SergeySenkin Distributions of the primary variables
PDFpdf MuPlusJets_HT_2orMoreBtags.pdf r2 r1 manage 87.9 K 2013-09-10 - 15:43 SergeySenkin Distributions of the primary variables
PNGpng MuPlusJets_HT_2orMoreBtags.png r2 r1 manage 179.5 K 2013-09-10 - 15:43 SergeySenkin Distributions of the primary variables
PDFpdf MuPlusJets_patType1CorrectedPFMet_2orMoreBtags.pdf r2 r1 manage 119.1 K 2013-09-10 - 15:43 SergeySenkin Distributions of the primary variables
PNGpng MuPlusJets_patType1CorrectedPFMet_2orMoreBtags.png r2 r1 manage 172.7 K 2013-09-10 - 15:43 SergeySenkin Distributions of the primary variables
PDFpdf MuPlusJets_patType1CorrectedPFMet_MT_2orMoreBtags.pdf r2 r1 manage 94.0 K 2013-09-10 - 15:44 SergeySenkin Distributions of the primary variables
PNGpng MuPlusJets_patType1CorrectedPFMet_MT_2orMoreBtags.png r2 r1 manage 170.7 K 2013-09-10 - 15:44 SergeySenkin Distributions of the primary variables
PDFpdf MuPlusJets_patType1CorrectedPFMet_ST_2orMoreBtags.pdf r2 r1 manage 89.6 K 2013-09-10 - 15:44 SergeySenkin Distributions of the primary variables
PNGpng MuPlusJets_patType1CorrectedPFMet_ST_2orMoreBtags.png r2 r1 manage 182.1 K 2013-09-10 - 15:44 SergeySenkin Distributions of the primary variables
PDFpdf MuPlusJets_patType1CorrectedPFMet_WPT_2orMoreBtags.pdf r2 r1 manage 78.2 K 2013-09-10 - 15:45 SergeySenkin Distributions of the primary variables
PNGpng MuPlusJets_patType1CorrectedPFMet_WPT_2orMoreBtags.png r2 r1 manage 173.5 K 2013-09-10 - 15:45 SergeySenkin Distributions of the primary variables
PDFpdf electron_bin_0-25.pdf r2 r1 manage 134.6 K 2013-09-10 - 15:17 SergeySenkin Results of the template fit
PNGpng electron_bin_0-25.png r2 r1 manage 80.1 K 2013-09-10 - 15:18 SergeySenkin Results of the template fit
PDFpdf electron_bin_150-inf.pdf r2 r1 manage 134.7 K 2013-09-10 - 15:20 SergeySenkin Results of the template fit
PNGpng electron_bin_150-inf.png r2 r1 manage 81.1 K 2013-09-10 - 15:20 SergeySenkin Results of the template fit
PDFpdf muon_bin_0-25.pdf r2 r1 manage 133.6 K 2013-09-10 - 15:20 SergeySenkin Results of the template fit
PNGpng muon_bin_0-25.png r2 r1 manage 78.2 K 2013-09-10 - 15:20 SergeySenkin Results of the template fit
PDFpdf muon_bin_150-inf.pdf r2 r1 manage 133.6 K 2013-09-10 - 15:20 SergeySenkin Results of the template fit
PNGpng muon_bin_150-inf.png r2 r1 manage 82.2 K 2013-09-10 - 15:20 SergeySenkin Results of the template fit
PDFpdf normalised_xsection_combined_different_generators_HT.pdf r2 r1 manage 155.6 K 2013-09-10 - 15:22 SergeySenkin Normalised differential cross sections compared to different generators
PNGpng normalised_xsection_combined_different_generators_HT.png r2 r1 manage 123.6 K 2013-09-10 - 15:22 SergeySenkin Normalised differential cross sections compared to different generators
PDFpdf normalised_xsection_combined_different_generators_MET.pdf r2 r1 manage 154.8 K 2013-09-10 - 15:22 SergeySenkin Normalised differential cross sections compared to different generators
PNGpng normalised_xsection_combined_different_generators_MET.png r2 r1 manage 133.1 K 2013-09-10 - 15:22 SergeySenkin Normalised differential cross sections compared to different generators
PDFpdf normalised_xsection_combined_different_generators_MT.pdf r2 r1 manage 152.9 K 2013-09-10 - 15:22 SergeySenkin Normalised differential cross sections compared to different generators
PNGpng normalised_xsection_combined_different_generators_MT.png r2 r1 manage 127.3 K 2013-09-10 - 15:22 SergeySenkin Normalised differential cross sections compared to different generators
PDFpdf normalised_xsection_combined_different_generators_ST.pdf r2 r1 manage 156.5 K 2013-09-10 - 15:22 SergeySenkin Normalised differential cross sections compared to different generators
PNGpng normalised_xsection_combined_different_generators_ST.png r2 r1 manage 139.0 K 2013-09-10 - 15:22 SergeySenkin Normalised differential cross sections compared to different generators
PDFpdf normalised_xsection_combined_different_generators_WPT.pdf r2 r1 manage 154.6 K 2013-09-10 - 15:22 SergeySenkin Normalised differential cross sections compared to different generators
PNGpng normalised_xsection_combined_different_generators_WPT.png r2 r1 manage 128.4 K 2013-09-10 - 15:22 SergeySenkin Normalised differential cross sections compared to different generators
PDFpdf normalised_xsection_combined_systematics_shifts_HT.pdf r2 r1 manage 155.9 K 2013-09-10 - 15:24 SergeySenkin Normalised differential cross sections compared to theoretical predictions showing the variation due to modelling uncertainties
PNGpng normalised_xsection_combined_systematics_shifts_HT.png r2 r1 manage 139.6 K 2013-09-10 - 15:24 SergeySenkin Normalised differential cross sections compared to theoretical predictions showing the variation due to modelling uncertainties
PDFpdf normalised_xsection_combined_systematics_shifts_MET.pdf r2 r1 manage 155.1 K 2013-09-10 - 15:24 SergeySenkin Normalised differential cross sections compared to theoretical predictions showing the variation due to modelling uncertainties
PNGpng normalised_xsection_combined_systematics_shifts_MET.png r2 r1 manage 145.8 K 2013-09-10 - 15:24 SergeySenkin Normalised differential cross sections compared to theoretical predictions showing the variation due to modelling uncertainties
PDFpdf normalised_xsection_combined_systematics_shifts_MT.pdf r2 r1 manage 153.2 K 2013-09-10 - 15:24 SergeySenkin Normalised differential cross sections compared to theoretical predictions showing the variation due to modelling uncertainties
PNGpng normalised_xsection_combined_systematics_shifts_MT.png r2 r1 manage 140.0 K 2013-09-10 - 15:24 SergeySenkin Normalised differential cross sections compared to theoretical predictions showing the variation due to modelling uncertainties
PDFpdf normalised_xsection_combined_systematics_shifts_ST.pdf r2 r1 manage 156.8 K 2013-09-10 - 15:24 SergeySenkin Normalised differential cross sections compared to theoretical predictions showing the variation due to modelling uncertainties
PNGpng normalised_xsection_combined_systematics_shifts_ST.png r2 r1 manage 153.8 K 2013-09-10 - 15:24 SergeySenkin Normalised differential cross sections compared to theoretical predictions showing the variation due to modelling uncertainties
PDFpdf normalised_xsection_combined_systematics_shifts_WPT.pdf r2 r1 manage 154.8 K 2013-09-10 - 15:24 SergeySenkin Normalised differential cross sections compared to theoretical predictions showing the variation due to modelling uncertainties
PNGpng normalised_xsection_combined_systematics_shifts_WPT.png r2 r1 manage 141.4 K 2013-09-10 - 15:24 SergeySenkin Normalised differential cross sections compared to theoretical predictions showing the variation due to modelling uncertainties
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Topic revision: r4 - 2014-03-26 - AndreasMeyer
 
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