TOP-14-012 Measurement of the differential ttbar production cross section for high-pT top quarks in e/μ+jets final states at √s = 8 TeV

Abstract

The differential top-antitop quark production cross section is measured for top quarks with high transverse momentum in pp collisions at a center-of-mass energy of 8 TeV. The data sample was collected with the CMS detector during 2012 and corresponds to an integrated luminosity of 19.7 ± 0.5 fb-1. The measurement is performed for events in e/μ+jets final states where the hadronically decaying top quark is reconstructed as a single, large-radius jet and identified as a top candidate using jet substructure techniques. The integrated cross section is measured at particle-level within a fiducial region resembling the detector-level selection as well as at parton-level. At particle-level, the cross section is measured to be σttbar = 1.28 ± 0.09 (stat + syst) ± 0.10 (PDF) ± 0.09 (Q2) ± 0.03 (lumi) pb for pT > 400 GeV. At parton-level, it is measured to be σttbar = 1.44 ± 0.10 (stat + syst) ± 0.13 (PDF) ± 0.15 (Q2) ± 0.04 (lumi) pb, 12% lower than the estimate from ttbar events simulated using Powheg. The hadronic top-jet candidate pT distribution is corrected for detector effects to extract normalized differential cross sections at particle- and parton-level.

Public Document

The CMS Physics Analysis Summary is available on CDS.

Figures

Figure1: Normalized differential cross section for the combined electron and muon channels in bins of particle-level top-jet pT, including all systematic uncertainties. The statistical and systematic (experimental and theoretical) uncertainties are shown separately.

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Figure1: Normalized differential cross section for the combined electron and muon channels in bins of parton-level top quark pT, including all systematic uncertainties. The statistical and systematic (experimental and theoretical) uncertainties are shown separately.

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Tables

Table 1: Estimates of the signal and background yields, together with the observed number of events in data, are shown after the combined maximum likelihood fit. The uncertainties listed are the total fit uncertainty, which includes the statistical component. The uncertainties do not include the theoretical uncertainties on the ttbar signal.

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Extra figures

Fitted values of the model compared to the observation in data for the 0 t-tag + ≥1 b-tag region for the muon+jets channel. The uncertainty band is the combination of post-fit uncertainties, statistical + systematic (exp.), on the signal and background yields, neglecting their correlations.

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Fitted values of the model compared to the observation in data for the 0 t-tag + ≥1 b-tag region for the electron+jets channel. The uncertainty band is the combination of post-fit uncertainties, statistical + systematic (exp.), on the signal and background yields, neglecting their correlations.

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Fitted values of the model compared to the observation in data for the 1 t-tag + 0 b-tag region for the muon+jets channel. The uncertainty band is the combination of post-fit uncertainties, statistical + systematic (exp.), on the signal and background yields, neglecting their correlations.

PDF - PNG

Fitted values of the model compared to the observation in data for the 1 t-tag + 0 b-tag region for the electron+jets channel. The uncertainty band is the combination of post-fit uncertainties, statistical + systematic (exp.), on the signal and background yields, neglecting their correlations.

PDF - PNG

Fitted values of the model compared to the observation in data for the 1 t-tag + 1 b-tag region for the muon+jets channel. The uncertainty band is the combination of post-fit uncertainties, statistical + systematic (exp.), on the signal and background yields, neglecting their correlations.

PDF - PNG

Fitted values of the model compared to the observation in data for the 1 t-tag + 1 b-tag region for the electron+jets channel. The uncertainty band is the combination of post-fit uncertainties, statistical + systematic (exp.), on the signal and background yields, neglecting their correlations.

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Distributions of the muon pseudorapidity for the kinematic region with 1 t-tag + 1 b-tag. The data observation is compared to the signal+background predictions using normalizations extracted from the likelihood fit. The uncertainty band is the combination of the statistical uncertainty and the total post-fit systematic uncertainties on the signal and background yields without shape uncertainties, neglecting their correlations.

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Distributions of the electron pseudorapidity for the kinematic region with 1 t-tag + 1 b-tag. The data observation is compared to the signal+background predictions using normalizations extracted from the likelihood fit. The uncertainty band is the combination of the statistical uncertainty and the total post-fit systematic uncertainties on the signal and background yields without shape uncertainties, neglecting their correlations.

PDF - PNG

Distribution of the pT of the hadronic-side, large-radius jet for the 0 t-tag + ≥1 b-tag region for the muon+jets channel. The data observation is compared to the signal+background predictions using normalizations extracted from the likelihood fit. The uncertainty band is the combination of the statistical uncertainty and the total post-fit systematic uncertainties on the signal and background yields without shape uncertainties, neglecting their correlations.

PDF - PNG

Distribution of the pT of the hadronic-side, large-radius jet for the 0 t-tag + ≥1 b-tag region for the electron+jets channel. The data observation is compared to the signal+background predictions using normalizations extracted from the likelihood fit. The uncertainty band is the combination of the statistical uncertainty and the total post-fit systematic uncertainties on the signal and background yields without shape uncertainties, neglecting their correlations.

PDF - PNG

Distribution of the pT of the hadronic-side, large-radius jet for the 1 t-tag + 0 b-tag region for the muon+jets channel. The data observation is compared to the signal+background predictions using normalizations extracted from the likelihood fit. The uncertainty band is the combination of the statistical uncertainty and the total post-fit systematic uncertainties on the signal and background yields without shape uncertainties, neglecting their correlations.

PDF - PNG

Distribution of the pT of the hadronic-side, large-radius jet for the 1 t-tag + 0 b-tag region for the electron+jets channel. The data observation is compared to the signal+background predictions using normalizations extracted from the likelihood fit. The uncertainty band is the combination of the statistical uncertainty and the total post-fit systematic uncertainties on the signal and background yields without shape uncertainties, neglecting their correlations.

PDF - PNG

Distribution of the pT of the hadronic-side, large-radius jet for the 1 t-tag + 1 b-tag region for the muon+jets channel. The data observation is compared to the signal+background predictions using normalizations extracted from the likelihood fit. The uncertainty band is the combination of the statistical uncertainty and the total post-fit systematic uncertainties on the signal and background yields without shape uncertainties, neglecting their correlations.

PDF - PNG

Distribution of the pT of the hadronic-side, large-radius jet for the 1 t-tag + 1 b-tag region for the electron+jets channel. The data observation is compared to the signal+background predictions using normalizations extracted from the likelihood fit. The uncertainty band is the combination of the statistical uncertainty and the total post-fit systematic uncertainties on the signal and background yields without shape uncertainties, neglecting their correlations.

PDF - PNG

Correlation matrix for the different fit variables and nuisance parameters observed in data.

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Bin migration matrix between the reconstructed top-jet pT and the particle-level top jet pT for the muon+jets channel. The bin migration matrix is normalized so that each bin of particle-level top jet pT (i.e. each row) adds up to 100%, including the over/underflow bins.

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Bin migration matrix between the reconstructed top-jet pT and the particle-level top jet pT for the electron+jets channel. The bin migration matrix is normalized so that each bin of particle-level top jet pT (i.e. each row) adds up to 100%, including the over/underflow bins.

PDF - PNG

Bin migration matrix between the particle-level top jet pT and the parton-level top quark pT for the muon+jets channel. The bin migration matrix is normalized so that each bin of particle-level top jet pT (i.e. each row) adds up to 100%, including the over/underflow bins.

PDF - PNG

Bin migration matrix between the particle-level top jet pT and the parton-level top quark pT for the muon+jets channel. The bin migration matrix is normalized so that each bin of particle-level top jet pT (i.e. each row) adds up to 100%, including the over/underflow bins.

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AndreasMeyer - 2015-08-12

Topic attachments
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