CMSB2G19001 ; CERNEP2024067  
Search for production of a single vectorlike quark decaying to tH or tZ in the allhadronic final state in pp collisions at $ \sqrt{s} = $ 13 TeV  
CMS Collaboration  
8 May 2024  
Accepted for publication in Phys. Rev. D  
Abstract: A search for electroweak production of a single vectorlike T quark in association with a bottom (b) quark in the allhadronic decay channel is presented. This search uses protonproton collision data at $ \sqrt{s} = $ 13 TeV collected by the CMS experiment at the CERN LHC during 20162018, corresponding to an integrated luminosity of 138 fb$ ^{1} $. The T quark is assumed to have charge 2$ / $3 and decay to a top (t) quark and a Higgs (H) or Z boson. Event kinematics and the presence of jets containing b hadrons are used to reconstruct the hadronic decays of the t quark and H or Z boson. No significant deviation from the standard model prediction is observed in the data. The 95% confidence level upper limits on the product of the production cross section and branching fraction of a T quark produced in association with a b quark and decaying via tH or tZ range from 1260 to 68 fb for T quark masses of 6001200 GeV.  
Links: eprint arXiv:2405.05071 [hepex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; 
Figures & Tables  Summary  Additional Figures  References  CMS Publications 

Figures  
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Figure 1:
Example of Feynman diagram for electroweak production of a vectorlike T quark. 
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Figure 2:
The fivejet invariant mass distribution in the 2M1L region after the highmass (green crosses) and lowmass (black circles) selections in 2018 data. The rightmost bin of the distribution is an overflow bin. The lowmass selection results in a mass distribution that is smoothly falling, unlike the highmass selection. The highmass selection is more efficient for T quark masses above 700 GeV by up to 25% while maintaining a similar background level, as detailed in Section 4.2.1. 
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Figure 3:
Weights from b tagging ratios (open markers) as functions of the fivejet invariant mass in 2018 data for the lowmass (upper) and highmass (lower) selections. The left graphs show weights connecting the 2M1L and 3M regions, and the right graphs show weights connecting the 3M and 3T regions. The red line corresponds to the central value of the transfer function and the shaded area represents the 95% confidence level uncertainty band. For the lowmass (highmass) analysis only signals with mass below (above) 800 GeV are tested, so primarily the lower (upper) part of the distribution contributes to the final result. 
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Figure 3a:
Weights from b tagging ratios (open markers) as functions of the fivejet invariant mass in 2018 data for the lowmass (upper) and highmass (lower) selections. The left graphs show weights connecting the 2M1L and 3M regions, and the right graphs show weights connecting the 3M and 3T regions. The red line corresponds to the central value of the transfer function and the shaded area represents the 95% confidence level uncertainty band. For the lowmass (highmass) analysis only signals with mass below (above) 800 GeV are tested, so primarily the lower (upper) part of the distribution contributes to the final result. 
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Figure 3b:
Weights from b tagging ratios (open markers) as functions of the fivejet invariant mass in 2018 data for the lowmass (upper) and highmass (lower) selections. The left graphs show weights connecting the 2M1L and 3M regions, and the right graphs show weights connecting the 3M and 3T regions. The red line corresponds to the central value of the transfer function and the shaded area represents the 95% confidence level uncertainty band. For the lowmass (highmass) analysis only signals with mass below (above) 800 GeV are tested, so primarily the lower (upper) part of the distribution contributes to the final result. 
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Figure 3c:
Weights from b tagging ratios (open markers) as functions of the fivejet invariant mass in 2018 data for the lowmass (upper) and highmass (lower) selections. The left graphs show weights connecting the 2M1L and 3M regions, and the right graphs show weights connecting the 3M and 3T regions. The red line corresponds to the central value of the transfer function and the shaded area represents the 95% confidence level uncertainty band. For the lowmass (highmass) analysis only signals with mass below (above) 800 GeV are tested, so primarily the lower (upper) part of the distribution contributes to the final result. 
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Figure 3d:
Weights from b tagging ratios (open markers) as functions of the fivejet invariant mass in 2018 data for the lowmass (upper) and highmass (lower) selections. The left graphs show weights connecting the 2M1L and 3M regions, and the right graphs show weights connecting the 3M and 3T regions. The red line corresponds to the central value of the transfer function and the shaded area represents the 95% confidence level uncertainty band. For the lowmass (highmass) analysis only signals with mass below (above) 800 GeV are tested, so primarily the lower (upper) part of the distribution contributes to the final result. 
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Figure 4:
The fivejet invariant mass distribution in the tH channel (black markers) after the highmass selection in the QCD multijet 3T control region (upper left), the $ \mathrm{t} \overline{\mathrm{t}} $ 2T1L control region (upper right), and the 3M signal region (lower) for the 2018 data. The histograms are the corresponding reweighted 2M1L distributions. The background distribution is normalized to the number of entries in the data. The shaded area corresponds to the statistical uncertainties in the 2M1L control regions. A potential 900 GeV T signal (red crosshatched histogram) is added to the background histogram demonstrating a negligible contribution. Similar results are observed in the tZ channel, and for the other years, but with slightly larger statistical uncertainties. 
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Figure 4a:
The fivejet invariant mass distribution in the tH channel (black markers) after the highmass selection in the QCD multijet 3T control region (upper left), the $ \mathrm{t} \overline{\mathrm{t}} $ 2T1L control region (upper right), and the 3M signal region (lower) for the 2018 data. The histograms are the corresponding reweighted 2M1L distributions. The background distribution is normalized to the number of entries in the data. The shaded area corresponds to the statistical uncertainties in the 2M1L control regions. A potential 900 GeV T signal (red crosshatched histogram) is added to the background histogram demonstrating a negligible contribution. Similar results are observed in the tZ channel, and for the other years, but with slightly larger statistical uncertainties. 
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Figure 4b:
The fivejet invariant mass distribution in the tH channel (black markers) after the highmass selection in the QCD multijet 3T control region (upper left), the $ \mathrm{t} \overline{\mathrm{t}} $ 2T1L control region (upper right), and the 3M signal region (lower) for the 2018 data. The histograms are the corresponding reweighted 2M1L distributions. The background distribution is normalized to the number of entries in the data. The shaded area corresponds to the statistical uncertainties in the 2M1L control regions. A potential 900 GeV T signal (red crosshatched histogram) is added to the background histogram demonstrating a negligible contribution. Similar results are observed in the tZ channel, and for the other years, but with slightly larger statistical uncertainties. 
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Figure 4c:
The fivejet invariant mass distribution in the tH channel (black markers) after the highmass selection in the QCD multijet 3T control region (upper left), the $ \mathrm{t} \overline{\mathrm{t}} $ 2T1L control region (upper right), and the 3M signal region (lower) for the 2018 data. The histograms are the corresponding reweighted 2M1L distributions. The background distribution is normalized to the number of entries in the data. The shaded area corresponds to the statistical uncertainties in the 2M1L control regions. A potential 900 GeV T signal (red crosshatched histogram) is added to the background histogram demonstrating a negligible contribution. Similar results are observed in the tZ channel, and for the other years, but with slightly larger statistical uncertainties. 
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Figure 5:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The fit is performed on the combined data from all three years in the alltH channel. 
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Figure 5a:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The fit is performed on the combined data from all three years in the alltH channel. 
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Figure 5b:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The fit is performed on the combined data from all three years in the alltH channel. 
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Figure 5c:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The fit is performed on the combined data from all three years in the alltH channel. 
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Figure 5d:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The fit is performed on the combined data from all three years in the alltH channel. 
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Figure 5e:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The fit is performed on the combined data from all three years in the alltH channel. 
png pdf 
Figure 5f:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The fit is performed on the combined data from all three years in the alltH channel. 
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Figure 6:
Observed $ p $values when considering the tH channel for each year and their combination. 
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Figure 7:
The observed and expected 95% CL limits on the cross section for associated production with a b quark for final states $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $ (upper left), $ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ (upper right), their sum $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $+$ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ (lower left), and $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $+$ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ including the leakage of tH events into the tZ channel (lower right) for different assumed values of the T quark mass. The vertical dashed line represents the crossover point in sensitivity: for masses to the left, the lowmass selection is used to set limits, while for masses to the right, the highmass selection is used to set limits. The red lines indicate the theoretical cross section for the singlet model [9]. 
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Figure 7a:
The observed and expected 95% CL limits on the cross section for associated production with a b quark for final states $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $ (upper left), $ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ (upper right), their sum $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $+$ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ (lower left), and $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $+$ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ including the leakage of tH events into the tZ channel (lower right) for different assumed values of the T quark mass. The vertical dashed line represents the crossover point in sensitivity: for masses to the left, the lowmass selection is used to set limits, while for masses to the right, the highmass selection is used to set limits. The red lines indicate the theoretical cross section for the singlet model [9]. 
png pdf 
Figure 7b:
The observed and expected 95% CL limits on the cross section for associated production with a b quark for final states $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $ (upper left), $ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ (upper right), their sum $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $+$ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ (lower left), and $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $+$ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ including the leakage of tH events into the tZ channel (lower right) for different assumed values of the T quark mass. The vertical dashed line represents the crossover point in sensitivity: for masses to the left, the lowmass selection is used to set limits, while for masses to the right, the highmass selection is used to set limits. The red lines indicate the theoretical cross section for the singlet model [9]. 
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Figure 7c:
The observed and expected 95% CL limits on the cross section for associated production with a b quark for final states $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $ (upper left), $ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ (upper right), their sum $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $+$ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ (lower left), and $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $+$ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ including the leakage of tH events into the tZ channel (lower right) for different assumed values of the T quark mass. The vertical dashed line represents the crossover point in sensitivity: for masses to the left, the lowmass selection is used to set limits, while for masses to the right, the highmass selection is used to set limits. The red lines indicate the theoretical cross section for the singlet model [9]. 
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Figure 7d:
The observed and expected 95% CL limits on the cross section for associated production with a b quark for final states $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $ (upper left), $ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ (upper right), their sum $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $+$ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ (lower left), and $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $+$ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ including the leakage of tH events into the tZ channel (lower right) for different assumed values of the T quark mass. The vertical dashed line represents the crossover point in sensitivity: for masses to the left, the lowmass selection is used to set limits, while for masses to the right, the highmass selection is used to set limits. The red lines indicate the theoretical cross section for the singlet model [9]. 
Tables  
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Table 1:
Mean and standard deviation values from a Gaussian fit of the H/Z/W boson and top quark mass distributions in the 700 GeV T quark sample, requiring the jet kinematic criteria described above and matching to generated particles. All quantities are in units of GeVns. The yeartoyear variations are within the jet energy scale uncertainties. 
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Table 2:
Definitions of the signal and control regions for the highmass selection. If the same selection is applied in all SRs and CRs, this is indicated by the $ \div $ symbol in the latter. If no selection is applied, this is indicated by the $  $ symbol. The ``3T'', ``3M'', and ``2T1L/2M1L'' represent region with three tight, three medium, and two tight/medium plus one loose b tagging requirements on the jets, respectively. 
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Table 3:
Cumulative efficiencies of the highmass selection criteria for signal and various simulated backgrounds in 2016 data. The first and last lines indicate the expected number of events normalized to an integrated luminosity of 35.9 fb$ ^{1} $. Only statistical uncertainties are reported. The ``Other backgrounds'' column includes W/Z+jets, single t, $ {\mathrm{t}\overline{\mathrm{t}}} \mathrm{H} $, and $ {\mathrm{t}\overline{\mathrm{t}}} \mathrm{Z} $ background processes. The $ {\mathrm{t}\overline{\mathrm{t}}} \mathrm{H} $ and $ {\mathrm{t}\overline{\mathrm{t}}} \mathrm{Z} $ processes do not form a resonance and have production rates roughly the same as the signal rate. 
Summary 
A search for a vectorlike top quark T in the single production mode was performed using protonproton collision events at $ \sqrt{s} = $ 13 TeV collected by the CMS experiment in 20162018. In this search, the T quark is assumed to couple only to standard model thirdgeneration quarks. We consider signatures containing a top quark and a Higgs (tH) or Z (tZ) boson decaying to a bottom quarkantiquark pair. The major background processes are top quarkantiquark pair and multijet production. The feature in the tH final state found in the previous search [23] is not confirmed with a larger dataset and improved event selection. No evidence for the T quark production in the $ \mathrm{p}\mathrm{p}\to\tprime\mathrm{b}\mathrm{q} $ process is seen and 95% confidence level upper limits are set on the product of the production cross section and branching fraction to tH and tZ that range from 1260 to 68 fb for T quark masses of 6001200 GeV. The limits are stronger than those in the previous search by at least a factor of three. 
Additional Figures  
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Additional Figure 1:
Weights from b tagging efficiency ratios (open markers) as a function of the fivejet invariant mass in 2016 (upper) and 2017 (lower) data for the lowmass selection. The left graph shows weights connecting the 2M1L and 3M regions, and the right graph shows weights connecting the 3M and 3T regions. The red line corresponds to the central value of the transfer function and the shaded area represents the 95% confidence level uncertainty band. For the lowmass analysis only signals with mass below 800 GeV are tested, so primarily the lower part of the distribution contributes to the final result. In the tZ channel, similar functions are derived. 
png pdf 
Additional Figure 1a:
Weights from b tagging efficiency ratios (open markers) as a function of the fivejet invariant mass in 2016 (upper) and 2017 (lower) data for the lowmass selection. The left graph shows weights connecting the 2M1L and 3M regions, and the right graph shows weights connecting the 3M and 3T regions. The red line corresponds to the central value of the transfer function and the shaded area represents the 95% confidence level uncertainty band. For the lowmass analysis only signals with mass below 800 GeV are tested, so primarily the lower part of the distribution contributes to the final result. In the tZ channel, similar functions are derived. 
png pdf 
Additional Figure 1b:
Weights from b tagging efficiency ratios (open markers) as a function of the fivejet invariant mass in 2016 (upper) and 2017 (lower) data for the lowmass selection. The left graph shows weights connecting the 2M1L and 3M regions, and the right graph shows weights connecting the 3M and 3T regions. The red line corresponds to the central value of the transfer function and the shaded area represents the 95% confidence level uncertainty band. For the lowmass analysis only signals with mass below 800 GeV are tested, so primarily the lower part of the distribution contributes to the final result. In the tZ channel, similar functions are derived. 
png pdf 
Additional Figure 1c:
Weights from b tagging efficiency ratios (open markers) as a function of the fivejet invariant mass in 2016 (upper) and 2017 (lower) data for the lowmass selection. The left graph shows weights connecting the 2M1L and 3M regions, and the right graph shows weights connecting the 3M and 3T regions. The red line corresponds to the central value of the transfer function and the shaded area represents the 95% confidence level uncertainty band. For the lowmass analysis only signals with mass below 800 GeV are tested, so primarily the lower part of the distribution contributes to the final result. In the tZ channel, similar functions are derived. 
png pdf 
Additional Figure 1d:
Weights from b tagging efficiency ratios (open markers) as a function of the fivejet invariant mass in 2016 (upper) and 2017 (lower) data for the lowmass selection. The left graph shows weights connecting the 2M1L and 3M regions, and the right graph shows weights connecting the 3M and 3T regions. The red line corresponds to the central value of the transfer function and the shaded area represents the 95% confidence level uncertainty band. For the lowmass analysis only signals with mass below 800 GeV are tested, so primarily the lower part of the distribution contributes to the final result. In the tZ channel, similar functions are derived. 
png pdf 
Additional Figure 2:
Weights from b tagging efficiency ratios (open markers) as a function of the fivejet invariant mass in 2016 (upper) and 2017 (lower) data for the highmass selection. The left graph shows weights connecting the 2M1L and 3M regions, and the right graph shows weights connecting the 3M and 3T regions. The red line corresponds to the central value of the transfer function and the shaded area represents the 95% confidence level uncertainty band. For the highmass analysis only signals with mass below (above) 800 GeV are tested, so primarily the upper part of the distribution contributes to the final result. In the tZ channel, similar functions are derived. 
png pdf 
Additional Figure 2a:
Weights from b tagging efficiency ratios (open markers) as a function of the fivejet invariant mass in 2016 (upper) and 2017 (lower) data for the highmass selection. The left graph shows weights connecting the 2M1L and 3M regions, and the right graph shows weights connecting the 3M and 3T regions. The red line corresponds to the central value of the transfer function and the shaded area represents the 95% confidence level uncertainty band. For the highmass analysis only signals with mass below (above) 800 GeV are tested, so primarily the upper part of the distribution contributes to the final result. In the tZ channel, similar functions are derived. 
png pdf 
Additional Figure 2b:
Weights from b tagging efficiency ratios (open markers) as a function of the fivejet invariant mass in 2016 (upper) and 2017 (lower) data for the highmass selection. The left graph shows weights connecting the 2M1L and 3M regions, and the right graph shows weights connecting the 3M and 3T regions. The red line corresponds to the central value of the transfer function and the shaded area represents the 95% confidence level uncertainty band. For the highmass analysis only signals with mass below (above) 800 GeV are tested, so primarily the upper part of the distribution contributes to the final result. In the tZ channel, similar functions are derived. 
png pdf 
Additional Figure 2c:
Weights from b tagging efficiency ratios (open markers) as a function of the fivejet invariant mass in 2016 (upper) and 2017 (lower) data for the highmass selection. The left graph shows weights connecting the 2M1L and 3M regions, and the right graph shows weights connecting the 3M and 3T regions. The red line corresponds to the central value of the transfer function and the shaded area represents the 95% confidence level uncertainty band. For the highmass analysis only signals with mass below (above) 800 GeV are tested, so primarily the upper part of the distribution contributes to the final result. In the tZ channel, similar functions are derived. 
png pdf 
Additional Figure 2d:
Weights from b tagging efficiency ratios (open markers) as a function of the fivejet invariant mass in 2016 (upper) and 2017 (lower) data for the highmass selection. The left graph shows weights connecting the 2M1L and 3M regions, and the right graph shows weights connecting the 3M and 3T regions. The red line corresponds to the central value of the transfer function and the shaded area represents the 95% confidence level uncertainty band. For the highmass analysis only signals with mass below (above) 800 GeV are tested, so primarily the upper part of the distribution contributes to the final result. In the tZ channel, similar functions are derived. 
png pdf 
Additional Figure 3:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T. The tZ channel is shown when the fit is performed on the combined data from all three years in the tZ and tH channels. 
png pdf 
Additional Figure 3a:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T. The tZ channel is shown when the fit is performed on the combined data from all three years in the tZ and tH channels. 
png pdf 
Additional Figure 3b:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T. The tZ channel is shown when the fit is performed on the combined data from all three years in the tZ and tH channels. 
png pdf 
Additional Figure 3c:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T. The tZ channel is shown when the fit is performed on the combined data from all three years in the tZ and tH channels. 
png pdf 
Additional Figure 3d:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T. The tZ channel is shown when the fit is performed on the combined data from all three years in the tZ and tH channels. 
png pdf 
Additional Figure 3e:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T. The tZ channel is shown when the fit is performed on the combined data from all three years in the tZ and tH channels. 
png pdf 
Additional Figure 3f:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T. The tZ channel is shown when the fit is performed on the combined data from all three years in the tZ and tH channels. 
png pdf 
Additional Figure 4:
The observed and expected 95% CL limits on the cross section for associated production with a b quark for final states $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $ (upper left), $ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ (upper right), their sum $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $+$ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ (lower left), and $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $+$ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ including the leakage of tH events into the tZ channel (bottom right) for different assumed values of the T mass in logarithmic scale. The vertical dashed line represents the crossover point in sensitivity: for masses to the left, the lowmass selection is used to set limits, while for masses to the right, the highmass selection is used to set limits. The red lines indicate the theoretical cross section for the singlet model. 
png pdf 
Additional Figure 4a:
The observed and expected 95% CL limits on the cross section for associated production with a b quark for final states $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $ (upper left), $ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ (upper right), their sum $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $+$ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ (lower left), and $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $+$ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ including the leakage of tH events into the tZ channel (bottom right) for different assumed values of the T mass in logarithmic scale. The vertical dashed line represents the crossover point in sensitivity: for masses to the left, the lowmass selection is used to set limits, while for masses to the right, the highmass selection is used to set limits. The red lines indicate the theoretical cross section for the singlet model. 
png pdf 
Additional Figure 4b:
The observed and expected 95% CL limits on the cross section for associated production with a b quark for final states $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $ (upper left), $ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ (upper right), their sum $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $+$ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ (lower left), and $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $+$ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ including the leakage of tH events into the tZ channel (bottom right) for different assumed values of the T mass in logarithmic scale. The vertical dashed line represents the crossover point in sensitivity: for masses to the left, the lowmass selection is used to set limits, while for masses to the right, the highmass selection is used to set limits. The red lines indicate the theoretical cross section for the singlet model. 
png pdf 
Additional Figure 4c:
The observed and expected 95% CL limits on the cross section for associated production with a b quark for final states $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $ (upper left), $ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ (upper right), their sum $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $+$ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ (lower left), and $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $+$ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ including the leakage of tH events into the tZ channel (bottom right) for different assumed values of the T mass in logarithmic scale. The vertical dashed line represents the crossover point in sensitivity: for masses to the left, the lowmass selection is used to set limits, while for masses to the right, the highmass selection is used to set limits. The red lines indicate the theoretical cross section for the singlet model. 
png pdf 
Additional Figure 4d:
The observed and expected 95% CL limits on the cross section for associated production with a b quark for final states $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $ (upper left), $ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ (upper right), their sum $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $+$ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ (lower left), and $ \mathrm{t}\mathrm{H}\mathrm{b}\mathrm{q} $+$ \mathrm{t}\mathrm{Z}\mathrm{b}\mathrm{q} $ including the leakage of tH events into the tZ channel (bottom right) for different assumed values of the T mass in logarithmic scale. The vertical dashed line represents the crossover point in sensitivity: for masses to the left, the lowmass selection is used to set limits, while for masses to the right, the highmass selection is used to set limits. The red lines indicate the theoretical cross section for the singlet model. 
png pdf 
Additional Figure 5:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The fit is performed on the combined data from all three years in the alltH channel. 
png pdf 
Additional Figure 5a:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The fit is performed on the combined data from all three years in the alltH channel. 
png pdf 
Additional Figure 5b:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The fit is performed on the combined data from all three years in the alltH channel. 
png pdf 
Additional Figure 5c:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The fit is performed on the combined data from all three years in the alltH channel. 
png pdf 
Additional Figure 5d:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The fit is performed on the combined data from all three years in the alltH channel. 
png pdf 
Additional Figure 5e:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The fit is performed on the combined data from all three years in the alltH channel. 
png pdf 
Additional Figure 5f:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The fit is performed on the combined data from all three years in the alltH channel. 
png pdf 
Additional Figure 6:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The tZ channel is shown when the fit is performed on the combined data from all three years in the tZ and tH channels. 
png pdf 
Additional Figure 6a:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The tZ channel is shown when the fit is performed on the combined data from all three years in the tZ and tH channels. 
png pdf 
Additional Figure 6b:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The tZ channel is shown when the fit is performed on the combined data from all three years in the tZ and tH channels. 
png pdf 
Additional Figure 6c:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The tZ channel is shown when the fit is performed on the combined data from all three years in the tZ and tH channels. 
png pdf 
Additional Figure 6d:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The tZ channel is shown when the fit is performed on the combined data from all three years in the tZ and tH channels. 
png pdf 
Additional Figure 6e:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The tZ channel is shown when the fit is performed on the combined data from all three years in the tZ and tH channels. 
png pdf 
Additional Figure 6f:
Fivejet invariant mass distributions after a backgroundonly fit (blue histogram) to the complete dataset (black markers) in the 2M1L (upper), 3M (middle), and 3T (lower) regions for lowmass (left) and the highmass (right) selections. The dashed blue band represents the uncertainty on the fitted background estimate, and red dashed line shows the expected signal distribution for a 700 GeV (lowmass selection) and a 900 GeV (highmass selection) T quark. The tZ channel is shown when the fit is performed on the combined data from all three years in the tZ and tH channels. 
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