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| CMS-HIG-17-026 ; CERN-EP-2018-065 | ||
| Search for $ {\mathrm{t\bar{t}}\mathrm{H}} $ production in the $ {\mathrm{H}\to\mathrm{b\bar{b}}} $ decay channel with leptonic $ \mathrm{t\bar{t}} $ decays in proton-proton collisions at $\sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| 10 April 2018 | ||
| JHEP 03 (2019) 026 | ||
| Abstract: A search is presented for the associated production of a standard model Higgs boson with a top quark-antiquark pair ($ {\mathrm{t\bar{t}}\mathrm{H}} $), in which the Higgs boson decays into a b quark-antiquark pair, in proton-proton collisions at a centre-of-mass energy $\sqrt{s} = $ 13 TeV. The data correspond to an integrated luminosity of 35.9 fb$^{-1}$ recorded with the CMS detector at the CERN LHC. Candidate $ {\mathrm{t\bar{t}}\mathrm{H}} $ events are selected that contain either one or two electrons or muons from the $ \mathrm{t\bar{t}} $ decays and are categorised according to the number of jets. Multivariate techniques are employed to further classify the events and eventually discriminate between signal and background. The results are characterised by an observed $ {\mathrm{t\bar{t}}\mathrm{H}} $ signal strength relative to the standard model cross section, $\mu = \sigma/\sigma_{\mathrm{SM}}$, under the assumption of a Higgs boson mass of 125 GeV. A combined fit of multivariate discriminant distributions in all categories results in an observed (expected) upper limit on $\mu$ of 1.5 (0.9) at 95% confidence level, and a best fit value of 0.72 $\pm$ 0.24 (stat) $\pm$ 0.38 (syst), corresponding to an observed (expected) signal significance of 1.6 (2.2) standard deviations above the background-only hypothesis. | ||
| Links: e-print arXiv:1804.03682 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; CADI line (restricted) ; | ||
| Figures & Tables | Summary | Additional Tables | References | CMS Publications |
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| Figures | |
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Figure 1:
Representative leading-order Feynman diagrams for $ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $ production, including the subsequent decay of the Higgs boson into a b quark-antiquark pair, and the decay of the top quark-antiquark pair into final states with either one (single-lepton channel, left) or two (dilepton channel, right) electrons or muons. |
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Figure 1-a:
Representative leading-order Feynman diagrams for $ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $ production, including the subsequent decay of the Higgs boson into a b quark-antiquark pair, and the decay of the top quark-antiquark pair into final states with one (single-lepton channel) electron or muon. |
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Figure 1-b:
Representative leading-order Feynman diagrams for $ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $ production, including the subsequent decay of the Higgs boson into a b quark-antiquark pair, and the decay of the top quark-antiquark pair into final states with two (dilepton channel) electrons or muons. |
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Figure 2:
Jet (left) and b-tagged jet (right) multiplicity in the single-lepton (SL) channel after the event selection described in the text. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands correspond to the total statistical and systematic uncertainties (excluding uncertainties that affect only the normalisation of the distribution) added in quadrature. The distributions observed in data (markers) are overlaid. The last bin includes overflow events. The lower plots show the ratio of the data to the background prediction. |
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Figure 2-a:
Jet jet multiplicity in the single-lepton (SL) channel after the event selection described in the text. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands correspond to the total statistical and systematic uncertainties (excluding uncertainties that affect only the normalisation of the distribution) added in quadrature. The distribution observed in data (markers) is overlaid. The last bin includes overflow events. The lower plot shows the ratio of the data to the background prediction. |
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Figure 2-b:
b-tagged jet multiplicity in the single-lepton (SL) channel after the event selection described in the text. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands correspond to the total statistical and systematic uncertainties (excluding uncertainties that affect only the normalisation of the distribution) added in quadrature. The distribution observed in data (markers) is overlaid. The last bin includes overflow events. The lower plot shows the ratio of the data to the background prediction. |
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Figure 3:
Jet (left) and b-tagged jet (right) multiplicity in the dilepton (DL) channel after the event selection described in the text. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands correspond to the total statistical and systematic uncertainties (excluding uncertainties that affect only the normalisation of the distribution) added in quadrature. The distributions observed in data (markers) are overlaid. The last bin includes overflow events. The lower plots show the ratio of the data to the background prediction. |
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Figure 3-a:
Jet jet multiplicity in the dilepton (DL) channel after the event selection described in the text. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands correspond to the total statistical and systematic uncertainties (excluding uncertainties that affect only the normalisation of the distribution) added in quadrature. The distribution observed in data (markers) is overlaid. The last bin includes overflow events. The lower plot shows the ratio of the data to the background prediction. |
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Figure 3-b:
b-tagged jet multiplicity in the dilepton (DL) channel after the event selection described in the text. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands correspond to the total statistical and systematic uncertainties (excluding uncertainties that affect only the normalisation of the distribution) added in quadrature. The distribution observed in data (markers) is overlaid. The last bin includes overflow events. The lower plot shows the ratio of the data to the background prediction. |
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Figure 4:
Illustration of the analysis strategy. |
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Figure 5:
Final discriminant shapes in the single-lepton (SL) channel before the fit to data: DNN discriminant in the jet-process categories with $\geq $6 jets-$ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $ (upper left); 5 jets-$ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ (upper right); 4 jets-$ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}\text {lf}} $ (lower left); and $\geq $6 jets-$ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {c}} {\overline {\mathrm {c}}}}} $ (lower right). The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The distributions observed in data (markers) are overlaid. The first and the last bins include underflow and overflow events, respectively. The lower plots show the ratio of the data to the background prediction. |
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Figure 5-a:
Final discriminant shapes in the single-lepton (SL) channel before the fit to data: DNN discriminant in the jet-process categories with $\geq $6 jets-$ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The distribution observed in data (markers) is overlaid. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
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Figure 5-b:
Final discriminant shapes in the single-lepton (SL) channel before the fit to data: DNN discriminant in the jet-process categories with 5 jets-$ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {b}} {\overline {\mathrm {b}}}}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The distribution observed in data (markers) is overlaid. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
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Figure 5-c:
Final discriminant shapes in the single-lepton (SL) channel before the fit to data: DNN discriminant in the jet-process categories with 4 jets-$ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}\text {lf}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The distribution observed in data (markers) is overlaid. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
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Figure 5-d:
Final discriminant shapes in the single-lepton (SL) channel before the fit to data: DNN discriminant in the jet-process categories with $\geq $6 jets-$ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {c}} {\overline {\mathrm {c}}}}} $.The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The distribution observed in data (markers) is overlaid. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
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Figure 6:
Final discriminant shapes in the dilepton (DL) channel before the fit to data: BDT discriminant in the analysis category with ($\geq$4 jets, 3 b tags) (upper row) and MEM discriminant in the analysis categories with ($\geq$4 jets, 4 b tags) (lower row) with low (left) and high (right) BDT output. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The distributions observed in data (markers) are overlaid. The first and the last bins include underflow and overflow events, respectively. The lower plots show the ratio of the data to the background prediction. |
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Figure 6-a:
Final discriminant shape in the dilepton (DL) channel before the fit to data: BDT discriminant in the analysis category with ($\geq$4 jets, 3 b tags). The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The distribution observed in data (markers) is overlaid. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
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Figure 6-b:
Final discriminant shape in the dilepton (DL) channel before the fit to data: MEM discriminant in the analysis categories with ($\geq$4 jets, 4 b tags) with low BDT output. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The distribution observed in data (markers) is overlaid. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
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Figure 6-c:
Final discriminant shape in the dilepton (DL) channel before the fit to data: MEM discriminant in the analysis categories with ($\geq$4 jets, 4 b tags) with high BDT output. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The distribution observed in data (markers) is overlaid. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
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Figure 7:
Final discriminant shapes in the single-lepton (SL) channel after the fit to data: DNN discriminant in the jet-process categories with $\geq $6 jets-$ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $ (upper left); 5 jets-$ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ (upper right); 4 jets-$ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}\text {lf}} $ (lower left); and $\geq $6 jets-$ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {c}} {\overline {\mathrm {c}}}}} $ (lower right). The hatched uncertainty bands include the total uncertainty after the fit to data. The distributions observed in data (markers) are overlaid. The first and the last bins include underflow and overflow events, respectively. The lower plots show the ratio of the data to the post-fit background plus signal distribution. |
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Figure 7-a:
Final discriminant shapes in the single-lepton (SL) channel after the fit to data: DNN discriminant in the jet-process categories with $\geq $6 jets-$ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $. The hatched uncertainty bands include the total uncertainty after the fit to data. The distribution observed in data (markers) is overlaid. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
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Figure 7-b:
Final discriminant shapes in the single-lepton (SL) channel after the fit to data: DNN discriminant in the jet-process categories with 5 jets-$ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {b}} {\overline {\mathrm {b}}}}} $. The hatched uncertainty bands include the total uncertainty after the fit to data. The distribution observed in data (markers) is overlaid. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
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Figure 7-c:
Final discriminant shapes in the single-lepton (SL) channel after the fit to data: DNN discriminant in the jet-process categories with 4 jets-$ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}\text {lf}} $. The hatched uncertainty bands include the total uncertainty after the fit to data. The distribution observed in data (markers) is overlaid. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
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Figure 7-d:
Final discriminant shapes in the single-lepton (SL) channel after the fit to data: DNN discriminant in the jet-process categories with $\geq $6 jets-$ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {c}} {\overline {\mathrm {c}}}}} $. The hatched uncertainty bands include the total uncertainty after the fit to data. The distribution observed in data (markers) is overlaid. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
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Figure 8:
Final discriminant shapes in the dilepton (DL) channel after the fit to data: BDT discriminant in the analysis category with ($\geq$4 jets, 3 b tags) (upper row) and MEM discriminant in the analysis categories with ($\geq$4 jets, 4 b tags) (lower row) with low (left) and high (right) BDT output. The hatched uncertainty bands include the total uncertainty after the fit to data. The distributions observed in data (markers) are overlaid. The first and the last bins include underflow and overflow events, respectively. The lower plots show the ratio of the data to the post-fit background plus signal distribution. |
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Figure 8-a:
Final discriminant shapes in the dilepton (DL) channel after the fit to data: BDT discriminant in the analysis category with ($\geq$4 jets, 3 b tags). The hatched uncertainty bands include the total uncertainty after the fit to data. The distribution observed in data (markers) is overlaid. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
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Figure 8-b:
Final discriminant shapes in the dilepton (DL) channel after the fit to data: MEM discriminant in the analysis categories with ($\geq$4 jets, 4 b tags) (lower row) with low highBDT output. The hatched uncertainty bands include the total uncertainty after the fit to data. The distribution observed in data (markers) is overlaid. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
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Figure 8-c:
Final discriminant shapes in the dilepton (DL) channel after the fit to data: MEM discriminant in the analysis categories with ($\geq$4 jets, 4 b tags) (lower row) with low highBDT output. The hatched uncertainty bands include the total uncertainty after the fit to data. The distribution observed in data (markers) is overlaid. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
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Figure 9:
Post-fit pull and impact on the signal strength $\mu$ of the nuisance parameters included in the fit, ordered by their impact. Only the 20 highest ranked parameters are shown, not including nuisance parameters describing the uncertainty due to the size of the simulated samples. The four highest-ranked nuisance parameters related to the jet energy scale uncertainty sources are shown as indicated in parentheses. The pulls of the nuisance parameters (black markers) are computed relative to their pre-fit values $\theta_{0}$ and uncertainties $\Delta \theta$. The impact $\Delta \mu$ is computed as the difference of the nominal best fit value of $\mu$ and the best fit value obtained when fixing the nuisance parameter under scrutiny to its best fit value $\hat{\theta}$ plus/minus its post-fit uncertainty (coloured areas). |
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Figure 10:
Bins of the final discriminants as used in the fit (left), reordered by the pre-fit expected signal-to-background ratio (S/B). Each of the shown bins includes multiple bins of the final discriminants with similar S/B. The fitted signal (cyan) is compared to the expectation for the SM Higgs boson $\mu = 1$ (red). Best fit values of the signal strength modifiers $\mu $ (right) with their 68% expected confidence intervals (outer error bar), also split into their statistical (inner error bar) and systematic components. |
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Figure 10-a:
Bins of the final discriminants as used in the fit, reordered by the pre-fit expected signal-to-background ratio (S/B). Each of the shown bins includes multiple bins of the final discriminants with similar S/B. The fitted signal (cyan) is compared to the expectation for the SM Higgs boson $\mu = 1$ (red). |
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Figure 10-b:
Best fit values of the signal strength modifiers $\mu $ with their 68% expected confidence intervals (outer error bar), also split into their statistical (inner error bar) and systematic components. |
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Figure 11:
Median expected (dashed line) and observed (markers) 95% CL upper limits on $\mu $. The inner (green) band and the outer (yellow) band indicate the regions containing 68 and 95%, respectively, of the distribution of limits expected under the background-only hypothesis. Also shown is the limit that is expected in case a SM $ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $ signal ($\mu =$ 1) is present in the data (solid red line). |
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Figure 12:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (4 jets, $\geq$3 b tags) and (from upper left to lower right) $ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {b}} {\overline {\mathrm {b}}}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}2 {\mathrm {b}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {\mathrm {b}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {c}} {\overline {\mathrm {c}}}}} $, and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}\text {lf}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plots show the ratio of the data to the background prediction. |
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Figure 12-a:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (4 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
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Figure 12-b:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (4 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {b}} {\overline {\mathrm {b}}}}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
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Figure 12-c:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (4 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}2 {\mathrm {b}}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
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Figure 12-d:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (4 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {\mathrm {b}}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
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Figure 12-e:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (4 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {c}} {\overline {\mathrm {c}}}}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
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Figure 12-f:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (4 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}\text {lf}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
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Figure 13:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (5 jets, $\geq$3 b tags) and (from upper left to lower right) $ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {b}} {\overline {\mathrm {b}}}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}2 {\mathrm {b}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {\mathrm {b}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {c}} {\overline {\mathrm {c}}}}} $, and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}\text {lf}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plots show the ratio of the data to the background prediction. |
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Figure 13-a:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (5 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
png pdf |
Figure 13-b:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (5 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {b}} {\overline {\mathrm {b}}}}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
png pdf |
Figure 13-c:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (5 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}2 {\mathrm {b}}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
png pdf |
Figure 13-d:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (5 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {\mathrm {b}}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
png pdf |
Figure 13-e:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (5 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {c}} {\overline {\mathrm {c}}}}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
png pdf |
Figure 13-f:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (5 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}\text {lf}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
png pdf |
Figure 14:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (6 jets, $\geq$3 b tags) and (from upper left to lower right) $ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {b}} {\overline {\mathrm {b}}}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}2 {\mathrm {b}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {\mathrm {b}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {c}} {\overline {\mathrm {c}}}}} $, and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}\text {lf}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plots show the ratio of the data to the background prediction. |
png pdf |
Figure 14-a:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (6 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
png pdf |
Figure 14-b:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (6 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {b}} {\overline {\mathrm {b}}}}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
png pdf |
Figure 14-c:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (6 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}2 {\mathrm {b}}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
png pdf |
Figure 14-d:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (6 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {\mathrm {b}}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
png pdf |
Figure 14-e:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (6 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {c}} {\overline {\mathrm {c}}}}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
png pdf |
Figure 14-f:
Final discriminant (DNN) shapes in the single-lepton (SL) channel before the fit to data, in the jet-process categories with (6 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}\text {lf}} $. The expected background contributions (filled histograms) are stacked, and the expected signal distribution (line), which includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes, is superimposed. Each contribution is normalised to an integrated luminosity of 35.9 fb$^{-1}$, and the signal distribution is additionally scaled by a factor of 15 for better visibility. The hatched uncertainty bands include the total uncertainty of the fit model. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the background prediction. |
png pdf |
Figure 15:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (4 jets, $\geq$3 b tags) and (from upper left to lower right) $ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {b}} {\overline {\mathrm {b}}}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}2 {\mathrm {b}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {\mathrm {b}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {c}} {\overline {\mathrm {c}}}}} $, and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}\text {lf}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plots show the ratio of the data to the post-fit background plus signal distribution. |
png pdf |
Figure 15-a:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (4 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
png pdf |
Figure 15-b:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (4 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {b}} {\overline {\mathrm {b}}}}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
png pdf |
Figure 15-c:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (4 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}2 {\mathrm {b}}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
png pdf |
Figure 15-d:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (4 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {\mathrm {b}}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
png pdf |
Figure 15-e:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (4 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {c}} {\overline {\mathrm {c}}}}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
png pdf |
Figure 15-f:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (4 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}\text {lf}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
png pdf |
Figure 16:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (5 jets, $\geq$3 b tags) and (from upper left to lower right) $ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {b}} {\overline {\mathrm {b}}}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}2 {\mathrm {b}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {\mathrm {b}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {c}} {\overline {\mathrm {c}}}}} $, and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}\text {lf}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plots show the ratio of the data to the post-fit background plus signal distribution. |
png pdf |
Figure 16-a:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (5 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
png pdf |
Figure 16-b:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (5 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {b}} {\overline {\mathrm {b}}}}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
png pdf |
Figure 16-c:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (5 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}2 {\mathrm {b}}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
png pdf |
Figure 16-d:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (5 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {\mathrm {b}}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
png pdf |
Figure 16-e:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (5 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {c}} {\overline {\mathrm {c}}}}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
png pdf |
Figure 16-f:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (5 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}\text {lf}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
png pdf |
Figure 17:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (6 jets, $\geq$3 b tags) and (from upper left to lower right) $ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {b}} {\overline {\mathrm {b}}}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}2 {\mathrm {b}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {\mathrm {b}}} $, $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {c}} {\overline {\mathrm {c}}}}} $, and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}\text {lf}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plots show the ratio of the data to the post-fit background plus signal distribution. |
png pdf |
Figure 17-a:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (6 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
png pdf |
Figure 17-b:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (6 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {b}} {\overline {\mathrm {b}}}}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
png pdf |
Figure 17-c:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (6 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}2 {\mathrm {b}}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
png pdf |
Figure 17-d:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (6 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {\mathrm {b}}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
png pdf |
Figure 17-e:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (6 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+} {{\mathrm {c}} {\overline {\mathrm {c}}}}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
png pdf |
Figure 17-f:
Final discriminant (DNN) shapes in the single-lepton (SL) channel after the fit to data, in the jet-process categories with (6 jets, $\geq$3 b tags) and $ {{{\mathrm {t}\overline {\mathrm {t}}}} \text {+}\text {lf}} $. The error bands include the total uncertainty after the fit to data. The first and the last bins include underflow and overflow events, respectively. The lower plot shows the ratio of the data to the post-fit background plus signal distribution. |
| Tables | |
png pdf |
Table 1:
Event yields observed in data and predicted by the simulation after the selection requirements described in the text: at least four jets, at least two of which are b tagged in the single-lepton (SL) channel, and at least two jets, at least one of which is b tagged in the dilepton (DL) channel. The $ {{{\mathrm {t}\overline {\mathrm {t}}}} {\mathrm {H}}} $ signal includes $ {{\mathrm {H}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}}} $ and all other Higgs boson decay modes. The quoted uncertainties are statistical only. |
png pdf |
Table 2:
Systematic uncertainties considered in the analysis, their corresponding type (affecting rate or shape of the distributions), and additional remarks. |
png pdf |
Table 3:
Observed and expected event yields per jet-process category (node) in the single-lepton channel with 4 jets and at least 3 b tags, prior to the fit to data (after the fit to data). The quoted uncertainties denote the total statistical and systematic components. |
png pdf |
Table 4:
Observed and expected event yields per jet-process category (node) in the single-lepton channel with 5 jets and at least 3 b tags, prior to the fit to data (after the fit to data). The quoted uncertainties denote the total statistical and systematic uncertainty. |
png pdf |
Table 5:
Observed and expected event yields per jet-process category (node) in the single-lepton channel with at least 6 jets and at least 3 b tags, prior to the fit to data (after the fit to data). The quoted uncertainties denote the total statistical and systematic uncertainty. |
png pdf |
Table 6:
Observed and expected event yields per jet-tag category in the dilepton channel, prior to the fit to data (after the fit to data). The quoted uncertainties denote the total statistical and systematic uncertainty. |
png pdf |
Table 7:
Best fit value of the signal strength modifier $\mu $ and the observed and median expected 95% CL upper limits in the single-lepton and the dilepton channels as well as the combined results. The one standard deviation confidence intervals of the expected limit and the best fit value are also quoted, split into the statistical and systematic components in the latter case. |
png pdf |
Table 8:
Contributions of different sources of uncertainties to the result for the fit to the data (observed) and to the expectation from simulation (expected). The quoted uncertainties $\Delta \mu $ in $\mu $ are obtained by fixing the listed sources of uncertainties to their post-fit values in the fit and subtracting the obtained result in quadrature from the result of the full fit. The statistical uncertainty is evaluated by fixing all nuisance parameters to their post-fit values. The quadratic sum of the contributions is different from the total uncertainty because of correlations between the nuisance parameters. |
png pdf |
Table 9:
Input variables used in the DNNs or BDTs in the different categories of the single-lepton and dilepton channels. Variables used in a specific multivariate method and analysis category are denoted by a "$+$'' and unused variables by a "$-$''. (Continued in Tables 10 and 11.) |
png pdf |
Table 10:
Continued from Table 9 and continued in Table 11. |
png pdf |
Table 11:
Continued from Table 10. |
png pdf |
Table 12:
Configuration of the BDTs used in the dilepton channel. |
| Summary |
| A search for the associated production of a Higgs boson and a top quark-antiquark pair ($ {\mathrm{t\bar{t}}\mathrm{H}} $) is performed using pp collision data recorded with the CMS detector at a centre-of-mass energy of 13 TeV in 2016, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. Candidate events are selected in final states compatible with the Higgs boson decaying into a b quark-antiquark pair and the single-lepton and dilepton decay channels of the $ \mathrm{t\bar{t}} $ system. Selected events are split into mutually exclusive categories according to their $ \mathrm{t\bar{t}} $ decay channel and jet content. In each category a powerful discriminant is constructed to separate the $ {\mathrm{t\bar{t}}\mathrm{H}} $ signal from the dominant ${\mathrm{t\bar{t}}}$+jets background, based on several multivariate analysis techniques (boosted decision trees, matrix element method, and deep neural networks). An observed (expected) upper limit on the $ {\mathrm{t\bar{t}}\mathrm{H}} $ production cross section $\mu$ relative to the SM expectations of 1.5 (0.9) at 95% confidence level is obtained. The best fit value of $\mu$ is 0.72 $\pm$ 0.24 (stat) $\pm$ 0.38 (syst). These results correspond to an observed (expected) significance of 1.6 (2.2) standard deviations above the background-only hypothesis. |
| Additional Tables | |
png pdf |
Additional Table 1:
Comparison of the sensitivity of the BDT+MEM and DNN methods using simulated data. The best-fit value of the signal strength modifier $\mu $ in the single-lepton and the dilepton channels as well as the combined results are listed, which have been obtained on Asimov data with a standard model signal injected. The one standard deviation confidence intervals are also quoted, split into the statistical and systematic components. |
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