TOP-12-041: Measurement of the Jet Multiplicity in Di-leptonic Top Quark Pair events


Abstract

Jet multiplicity distributions in top pair events are measured in pp collisions at 8 TeV with the CMS detector using a dataset corresponding to 19.6 fb−1 , collected in 2012. The measurement is performed in the dileptonic decay channels of the top-antitop quark pairs. The normalised differential top anti-top quark cross section is measured as a function of the jet multiplicity for different jet pT thresholds. The kinematic properties of the leading additional jets are presented. Furthermore, the distribution of the fraction of events without additional jets above a threshold is measured as functions of the leading additional jets transverse momentum and of the scalar sum of the transverse momenta of all additional jets. The data are compared with several predictions from perturbative QCD calculations

Figures

Jet multiplicity and kinematic distributions of the additional jets after event selection

Figure Caption
HypJetMultpt30.png Reconstructed jet multiplicity distribution in the event after event selection for all jets with transverse momenta of at least 30 GeV. The ttbar sample is simulated using MADGRAPH. "ttbar signal" refers to the events decaying dileptonically, "ttbar other" refers to the rest of the decay modes, including ttbar decays intro prompt tau-leptons. Notice that the event selection requires two jets with pt>30 GeV. [Get pdf version]
HypJetMultpt60.png Reconstructed jet multiplicity distribution in the event after event selection for all jets with transverse momenta of at least 60 GeV. The ttbar sample is simulated using MADGRAPH. "ttbar signal" refers to the events decaying dileptonically, "ttbar other" refers to the rest of the decay modes, including ttbar decays intro prompt tau-leptons. Notice that the event selection requires two jets with pt>30 GeV. [Get pdf version]
HypJetMultpt100.png Reconstructed jet multiplicity distribution in the event after event selection for all jets with transverse momenta of at least 100 GeV. The ttbar sample is simulated using MADGRAPH. "ttbar signal" refers to the events decaying dileptonically, "ttbar other" refers to the rest of the decay modes, including ttbar decays intro prompt tau-leptons. Notice that the event selection requires two jets with pt>30 GeV. [Get pdf version]
HypExtraJetpT.png Distribution of the transverse momentum of the first leading additional reconstructed jets compared to signal and background simulated samples. [Get pdf version]
HypExtraJetEta.png Distribution of eta of the first leading additional reconstructed jets compared to signal and background simulated samples. [Get pdf version]
HypExtraJetpT2.png Distribution of the transverse momentum of the second leading additional reconstructed jets compared to signal and background simulated samples. [Get pdf version]
HypExtraJetEta2.png Distribution of eta of the second leading additional reconstructed jets compared to signal and background simulated samples. [Get pdf version]

Normalised differential cross sections as a function of jet multiplicity, for three different jet-pt thresholds

Figure Caption
DiffXS_HypJetMultpt30.png DiffXS_HypJetMultpt30Mad.png Normalised differential cross-section as a function of jet multiplicity for jets with pT>30GeV. The data are compared with predictions from MADGRAPH+Pythia, MCATNLO+Herwig and POWHEG+Pythia [Get pdf version], as well as with predictions from MADGRAPH with varied Q2 scale and jet-parton matching threshold [Get pdf version]. The errors on the data points indicate the statistical (inner bars) and the total uncertainty.
DiffXS_HypJetMultpt60.png DiffXS_HypJetMultpt30Mad.png Normalised differential cross-section as a function of jet multiplicity for jets with pT>60GeV. The data are compared with predictions from MADGRAPH+Pythia, MCATNLO+Herwig and POWHEG+Pythia [Get pdf version], as well as with predictions from MADGRAPH with varied Q2 scale and jet-parton matching threshold [Get pdf version]. The errors on the data points indicate the statistical (inner bars) and the total uncertainty.
DiffXS_HypJetMultpt100.png DiffXS_HypJetMultpt30Mad.png Normalised differential cross-section as a function of jet multiplicity for jets with pT>100GeV. The data are compared with predictions from MADGRAPH+Pythia, MCATNLO+Herwig and POWHEG+Pythia [Get pdf version], as well as with predictions from MADGRAPH with varied Q2 scale and jet-parton matching threshold [Get pdf version]. The errors on the data points indicate the statistical (inner bars) and the total uncertainty.

"Gap fraction"

Figure Caption
Gap1jet_allPow.png Gap1jet_allMad.png Measured gap fraction as a function of the leading additional jet pt. Data are compared to predictions from MADGRAPH+Pythia, POWHEG+Pythia and MC@NLO+Herwig [Get pdf version], as well as MADGRAPH with varied Q2 and jet-parton matching scales [Get pdf version]. The errors on the data points indicate the statistical uncertainty. The shaded band corresponds to the statistical and systematic uncertainties added in quadrature.
Gap2jet_allPow.png Gap2jet_allMad.png Measured gap fraction as a function of the second highest-pt additional jet pt. Data are compared to predictions from MADGRAPH+Pythia, POWHEG+Pythia and MC@NLO+Herwig [Get pdf version], as well as MADGRAPH with varied Q2 and jet-parton matching scales [Get pdf version]. The errors on the data points indicate the statistical uncertainty. The shaded band corresponds to the statistical and systematic uncertainties added in quadrature.
GapHT_allPow.png GapHT_allMad.png Measured gap fraction as a function of the scalar sum of the pt of the additional jets. Data are compared to predictions from MADGRAPH+Pythia, POWHEG+Pythia and MC@NLO+Herwig [Get pdf version], as well as MADGRAPH with varied Q2 and jet-parton matching scales [Get pdf version]. The shaded band corresponds to the statistical and systematic uncertainties added in quadrature.

Rapidity regions  
Figure Caption
Gap1jet_rap08Pow.png Gap1jet_rap0815Pow.png Gap1jet_rap1521Pow.png Gap fraction as a function of the leading additional jet pt in different rapidity ranges abs(eta)<0.8, 0.8<abs(eta)<1.5, 1.5<abs(eta)<2.1. The pt threshold is varied from 35 GeV to 380 GeV. Data are compared to predictions from MADGRAPH+Pythia, POWHEG+Pythia and MC@NLO+Herwig. The errors on the data points indicate the statistical uncertainty (binomial errors). The shaded band corresponds to the statistical and systematic uncertainties added in quadrature. Links to the PDF versions : abs(eta)<0.8,0.8<abs(eta)<1.5, 1.5<abs(eta)<2.1.
Gap1jet_rap08Mad.png Gap1jet_rap0815Mad.png Gap1jet_rap1521Mad.png Gap fraction as a function of the leading additional jet pt in different rapidity ranges abs(eta)<0.8, 0.8<abs(eta)<1.5, 1.5<abs(eta)<2.1. The pt threshold is varied from 35 GeV to 380 GeV. Data are compared to predictions from the nominal MADGRAPH+Pythia and to MADGRAPH with varied Q2 and jet-parton matching scales. The errors on the data points indicate the statistical uncertainty (binomial errors). The shaded band corresponds to the statistical and systematic uncertainties added in quadrature. Links to the PDF versions : abs(eta)<0.8,0.8<abs(eta)<1.5, 1.5<abs(eta)<2.1.
Gap2jet_rap08Pow.png Gap2jet_rap0815Pow.png Gap2jet_rap1521Pow.png Gap fraction as a function of the second leading additional jet pt in different rapidity ranges abs(eta)<0.8, 0.8<abs(eta)<1.5, 1.5<abs(eta)<2.1. The pt threshold is varied from 35 GeV to 180 GeV. Data are compared to predictions from MADGRAPH+Pythia, POWHEG+Pythia and MC@NLO+Herwig. The errors on the data points indicate the statistical uncertainty (binomial errors). The shaded band corresponds to the statistical and systematic uncertainties added in quadrature. Links to the PDF versions : abs(eta)<0.8,0.8<abs(eta)<1.5, 1.5<abs(eta)<2.1.
Gap2jet_rap08Mad.png Gap2jet_rap0815Mad.png Gap2jet_rap1521Mad.png Gap fraction as a function of the second leading additional jet pt in different rapidity ranges abs(eta)<0.8, 0.8<abs(eta)<1.5, 1.5<abs(eta)<2.1. The pt threshold is varied from 35 GeV to 180 GeV. Data are compared to predictions from the nominal MADGRAPH+Pythia and to MADGRAPH with varied Q2 and jet-parton matching scales. The errors on the data points indicate the statistical uncertainty (binomial errors). The shaded band corresponds to the statistical and systematic uncertainties added in quadrature. Links to the PDF versions : abs(eta)<0.8,0.8<abs(eta)<1.5, 1.5<abs(eta)<2.1.
GapHT_rap08Pow.png GapHT_rap0815Pow.png GapHT_rap1521Pow.png Gap fraction as a function of the scalar sum of the pt of the additional jets in different rapidity ranges abs(eta)<0.8, 0.8<abs(eta)<1.5, 1.5<abs(eta)<2.1. The pt threshold is varied from 35 GeV to 190 GeV. Data are compared to predictions from MADGRAPH+Pythia, POWHEG+Pythia and MC@NLO+Herwig. The errors on the data points indicate the statistical uncertainty (binomial errors). The shaded band corresponds to the statistical and systematic uncertainties added in quadrature. Links to the PDF versions : abs(eta)<0.8,0.8<abs(eta)<1.5, 1.5<abs(eta)<2.1
GapHT_rap08Mad.png GapHT_rap0815Mad.png GapHT_rap1521Mad.png Gap fraction as a function of the scalar sum of the pt of the additional jets in different rapidity ranges abs(eta)<0.8, 0.8<abs(eta)<1.5, 1.5<abs(eta)<2.1. The pt threshold is varied from 35 GeV to 380 GeV. Data are compared to predictions from the nominal MADGRAPH+Pythia and to MADGRAPH with varied Q2 and jet-parton matching scales. The errors on the data points indicate the statistical uncertainty (binomial errors). The shaded band corresponds to the statistical and systematic uncertainties added in quadrature. Links to the PDF versions : abs(eta)<0.8,0.8<abs(eta)<1.5, 1.5<abs(eta)<2.1.

Kinematic variables additional jets

Figure Caption
InclusiveHypExtraJetpTPOW.png InclusiveHypExtraJetpTMAD.png InclusiveHypExtraJetpT2POW.png InclusiveHypExtraJetpT2MAD.png Transverse momentum of the first leading additional jet (top) and the second leading additional jet (bottom). The distributions are obtained at reconstructed level, the expected BG contribution is subtracted. Data are compared to predictions from MADGRAPH+Pythia, POWHEG+Pythia and MC@NLO+Herwig (left) and to MADGRAPH with varied Q2 and jet-parton matching scales (right). All the predictions are normalised to the luminosity in data using the the in-situ measured cross section in the same phase space. Links to the PDF versions : top left,top right, bottom left, bottom right.
InclusiveHypExtraJetEtaPOW.png InclusiveHypExtraJetEtaMAD.png InclusiveHypExtraJetEta2POW.png InclusiveHypExtraJetEta2MAD.png Distributions of the pseudorapidity first leading additional jet (top) and the second leading additional jet (bottom). The distributions are obtained at reconstructed level, where the expected BG contribution is subtracted. Data are compared to predictions from MADGRAPH+Pythia, POWHEG+Pythia and MC@NLO+Herwig (left) and to MADGRAPH with varied Q2 and jet-parton matching scales (right). All the predictions are normalised to the luminosity in data using the the in-situ measured cross section in the same phase space. Links to the PDF versions : top left,top right, bottom left, bottom right.
InclusiveHypDeltaRExtraJet12POW.png InclusiveHypDeltaRExtraJet12MAD.png DeltaR between the first and the second additional jets. The distributions are obtained at reconstructed level, where the expected BG contribution is subtracted. Data are compared to predictions from MADGRAPH+Pythia, POWHEG+Pythia and MC@NLO+Herwig (left) and to MADGRAPH with varied Q2 and jet-parton matching scales (right). All the predictions are normalised to the luminosity in data using the the in-situ measured cross section in the same phase space. Links to the PDF versions: left, right.
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