Measurement of Higgs boson decay into $b$-quarks in associated production with a top-quark pair in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

The ATLAS collaboration
JHEP 06 (2022) 097, 2022.

Abstract (data abstract)
The associated production of a Higgs boson and a top-quark pair is measured in events characterised by the presence of one or two electrons or muons. The Higgs boson decay into a $b$-quark pair is used. The analysed data, corresponding to an integrated luminosity of 139 fb$^{-1}$, were collected in proton--proton collisions at the Large Hadron Collider between 2015 and 2018 at a centre-of-mass energy of $\sqrt{s}=13$ TeV. The measured signal strength, defined as the ratio of the measured signal yield to that predicted by the Standard Model, is $0.35^{+0.36}_{-0.34}$. This result is compatible with the Standard Model prediction and corresponds to an observed (expected) significance of 1.0 (2.7) standard deviations. The signal strength is also measured differentially in bins of the Higgs boson transverse momentum in the simplified template cross-section framework, including a bin for specially selected boosted Higgs bosons with transverse momentum above 300 GeV.

  • Figure 2a

    Data from Figure 2a

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    Comparison between data and prediction for the DNN $P(H)$ output for the Higgs boson candidate prior to any fit to...

  • Figure 2b

    Data from Figure 2b

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    Comparison between data and prediction for the DNN $P(H)$ output for the Higgs boson candidate prior to any fit to...

  • Figure 3

    Data from Figure 3

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    Performance of the Higgs boson reconstruction algorithms. For each row of `truth' ${\hat{p}_{{T}}^{H}}$, the matrix shows (in percentages) the fraction...

  • Figure 4a

    Data from Figure 4a

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    Pre-fit distribution of the reconstructed Higgs boson candidate $p_T^H$ for the dilepton $SR^{\geq 4j}_{\geq 4b}$ signal region. The dashed line...

  • Figure 4b

    Data from Figure 4b

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    Pre-fit distribution of the reconstructed Higgs boson candidate $p_T^H$ for the single-lepton resolved $SR^{\geq 6j}_{\geq 4b}$ signal region. The dashed...

  • Figure 4c

    Data from Figure 4c

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    Pre-fit distribution of the reconstructed Higgs boson candidate $p_T^H$ for the single-lepton boosted ${{SR}_{{boosted}}}$ signal region. The dashed line shows...

  • Figure 5a

    Data from Figure 5a

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    Comparison of predicted and observed event yields in each of the control and signal regions in the dilepton channel after...

  • Figure 5b

    Data from Figure 5b

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    Comparison of predicted and observed event yields in each of the control and signal regions in the single-lepton channels after...

  • Figure 6a

    Data from Figure 6a

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    Comparison between data and prediction for the BDT discriminant in the dilepton SRs after the inclusive fit to the data...

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    Data from Figure 6b

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    Comparison between data and prediction for the BDT discriminant in the dilepton SRs after the inclusive fit to the data...

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    Data from Figure 6c

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    Comparison between data and prediction for the BDT discriminant in the dilepton SRs after the inclusive fit to the data...

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    Data from Figure 6d

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    Comparison between data and prediction for the BDT discriminant in the dilepton SRs after the inclusive fit to the data...

  • Figure 7a

    Data from Figure 7a

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    Comparison between data and prediction for the BDT discriminant in the single-lepton resolved SRs after the inclusive fit to the...

  • Figure 7b

    Data from Figure 7b

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    Comparison between data and prediction for the BDT discriminant in the single-lepton resolved SRs after the inclusive fit to the...

  • Figure 7c

    Data from Figure 7c

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    Comparison between data and prediction for the BDT discriminant in the single-lepton resolved SRs after the inclusive fit to the...

  • Figure 7d

    Data from Figure 7d

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    Comparison between data and prediction for the BDT discriminant in the single-lepton resolved SRs after the inclusive fit to the...

  • Figure 7e

    Data from Figure 7e

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    Comparison between data and prediction for the BDT discriminant in the single-lepton resolved SRs after the inclusive fit to the...

  • Figure 7f

    Data from Figure 7f

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    Comparison between data and prediction for the BDT discriminant in the single-lepton boosted SRs after the inclusive fit to the...

  • Figure 7g

    Data from Figure 7g

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    Comparison between data and prediction for the BDT discriminant in the single-lepton boosted SRs after the inclusive fit to the...

  • Figure 8a

    Data from Figure 8a

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    Comparison between data and prediction for ${\Delta R^{{avg}}_{bb}}$ after the inclusive fit to the data in the single-lepton $CR^{5j}_{{\geq}4b\ lo}$...

  • Figure 8b

    Data from Figure 8b

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    Comparison between data and prediction for ${\Delta R^{{avg}}_{bb}}$ after the inclusive fit to the data in the single-lepton $CR^{5j}_{{\geq}4b\ hi}$...

  • Figure 9

    Data from Figure 9

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    Post-fit yields of signal ($S$) and total background ($B$) as a function of $\log (S/B)$, compared with data. Final-discriminant bins...

  • Figure 10a

    Data from Figure 10a

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    Comparison between data and prediction for the reconstruction BDT score for the Higgs boson candidate identified using Higgs boson information,...

  • Figure 10b

    Data from Figure 10b

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    Comparison between data and prediction for the average $\Delta \eta $ between $b$-tagged jets, after the inclusive fit to the...

  • Figure 11a

    Data from Figure 11a

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    Comparison between data and prediction for the likelihood discriminant, after the inclusive fit to the data in the single-lepton resolved...

  • Figure 11b

    Data from Figure 11b

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    Comparison between data and prediction for the average $\Delta R$ for all possible combinations of $b$-tagged jet pairs, after the...

  • Figure 12a

    Data from Figure 12a

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    Comparison between data and prediction for the DNN $P(H)$ output for the Higgs boson candidate after the inclusive fit to...

  • Figure 12b

    Data from Figure 12b

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    Comparison between data and prediction for the DNN $P(H)$ output for the Higgs boson candidate after the inclusive fit to...

  • Figure 13a

    Data from Figure 13a

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    Post-fit distribution of the reconstructed Higgs boson candidate mass for the dilepton $SR^{\geq 4j}_{\geq 4b}$ signal region. The ${t\bar {t}H}$...

  • Figure 13b

    Data from Figure 13b

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    Post-fit distribution of the reconstructed Higgs boson candidate mass for the single-lepton resolved $SR^{\geq 6j}_{\geq 4b}$ signal region. The ${t\bar...

  • Figure 13c

    Data from Figure 13c

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    Post-fit distribution of the reconstructed Higgs boson candidate mass for the single-lepton boosted ${{SR}_{{boosted}}}$ signal region. The ${t\bar {t}H}$ signal...

  • Figure 14

    Data from Figure 14

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    Fitted values of the ${t\bar {t}H}$ signal strength parameter in the individual channels and in the inclusive signal-strength measurement.

  • Figure 15

    Data from Figure 15

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    Ranking of the 20 nuisance parameters with the largest post-fit impact on $\mu $ in the fit. Nuisance parameters corresponding...

  • Figure 16a

    Data from Figure 16a

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    Pre-fit distribution of the number of jets in the dilepton $SR^{\geq 4j}_{\geq 4b}$ signal region. The ${t\bar {t}H}$ signal yield...

  • Figure 16b

    Data from Figure 16b

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    Pre-fit distribution of the number of jets in the single-lepton resolved $SR^{\geq 6j}_{\geq 4b}$ signal region. The ${t\bar {t}H}$ signal...

  • Figure 16c

    Data from Figure 16c

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    Pre-fit distribution of the number of jets in the single-lepton boosted ${{SR}_{{boosted}}}$ signal region. The ${t\bar {t}H}$ signal yield (solid...

  • Figure 16d

    Data from Figure 16d

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    Post-fit distribution of the number of jets in the dilepton $SR^{\geq 4j}_{\geq 4b}$ signal region. The ${t\bar {t}H}$ signal yield...

  • Figure 16e

    Data from Figure 16e

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    Post-fit distribution of the number of jets in the single-lepton resolved $SR^{\geq 6j}_{\geq 4b}$ signal region. The ${t\bar {t}H}$ signal...

  • Figure 16f

    Data from Figure 16f

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    Post-fit distribution of the number of jets in the single-lepton boosted ${{SR}_{{boosted}}}$ signal region. The ${t\bar {t}H}$ signal yield (solid...

  • Figure 17a

    Data from Figure 17a

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    Post-fit distribution of the reconstructed Higgs boson candidate $p_T^H$ for the dilepton $SR^{\geq 4j}_{\geq 4b}$ signal region. The ${t\bar {t}H}$...

  • Figure 17b

    Data from Figure 17b

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    Post-fit distribution of the reconstructed Higgs boson candidate $p_T^H$ for the single-lepton resolved $SR^{\geq 6j}_{\geq 4b}$ signal region. The ${t\bar...

  • Figure 17c

    Data from Figure 17c

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    Post-fit distribution of the reconstructed Higgs boson candidate $p_T^H$ for the single-lepton boosted ${{SR}_{{boosted}}}$ signal region. The ${t\bar {t}H}$ signal...

  • Figure 18

    Data from Figure 18

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    Signal-strength measurements in the individual STXS ${\hat{p}_{{T}}^{H}}$ bins, as well as the inclusive signal strength.

  • Figure 19

    Data from Figure 19

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    95% CL simplified template cross-section upper limits in the individual STXS ${\hat{p}_{{T}}^{H}}$ bins, as well as the inclusive limit. The...

  • Figure 22

    Data from Figure 22

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    The ratios $S/B$ (black solid line, referring to the vertical axis on the left) and $S/\sqrt{B}$ (red dashed line, referring...

  • Figure 23a

    Data from Figure 23a

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    Comparison between data and prediction for the $\Delta R$ between the Higgs candidate and the ${t\bar {t}}$ candidate system, after...

  • Figure 23b

    Data from Figure 23b

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    Comparison between data and prediction for the number of $b$-tagged jet pairs with an invariant mass within 30 GeV of...

  • Figure 24a

    Data from Figure 24a

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    Comparison between data and prediction for the reconstruction BDT score for the Higgs boson candidate identified using Higgs boson information,...

  • Figure 24b

    Data from Figure 24b

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    Comparison between data and prediction for the $\Delta R$ between the two highest ${p_{{T}}}$ $b$-tagged jets, after the inclusive fit...

  • Figure 25a

    Data from Figure 25a

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    Comparison between data and prediction for the sum of $b$-tagging discriminants of jets from Higgs, hadronic top and leptonic top...

  • Figure 25b

    Data from Figure 25b

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    Comparison between data and prediction for the sum of $b$-tagging discriminants of jets from Higgs, hadronic top and leptonic top...

  • Figure 25c

    Data from Figure 25c

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    Comparison between data and prediction for the hadronic top candidate invariant mass, after the inclusive fit to the data in...

  • Figure 25d

    Data from Figure 25d

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    Comparison between data and prediction for the hadronic top candidate invariant mass, after the inclusive fit to the data in...

  • Figure 25e

    Data from Figure 25e

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    Comparison between data and prediction for the fraction of the sum of $b$-tagging discriminants of all jets not associated to...

  • Figure 25f

    Data from Figure 25f

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    Comparison between data and prediction for the fraction of the sum of $b$-tagging discriminants of all jets not associated to...

  • Figure 26a

    Data from Figure 26a

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    Ranking of the 20 nuisance parameters with the largest post-fit impact on $\mu $ in the STXS fit for $0\le...

  • Figure 26b

    Data from Figure 26b

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    Ranking of the 20 nuisance parameters with the largest post-fit impact on $\mu $ in the STXS fit for $120\le...

  • Figure 26c

    Data from Figure 26c

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    Ranking of the 20 nuisance parameters with the largest post-fit impact on $\mu $ in the STXS fit for $200\le...

  • Figure 26d

    Data from Figure 26d

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    Ranking of the 20 nuisance parameters with the largest post-fit impact on $\mu $ in the STXS fit for $300\le...

  • Figure 26e

    Data from Figure 26e

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    Ranking of the 20 nuisance parameters with the largest post-fit impact on $\mu $ in the STXS fit for ${\hat{p}_{{T}}^{H}}\ge...

  • Figure 27

    Data from Figure 27

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    95% confidence level upper limits on signal-strength measurements in the individual STXS ${\hat{p}_{{T}}^{H}}$ bins, as well as the inclusive signal-strength...

  • Figure 28

    Data from Figure 28

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    Post-fit correlation matrix (in percentages) between the $\mu $ values obtained in the STXS bins.

  • Figure 29

    Data from Figure 29

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    Performance of the Higgs boson reconstruction algorithms. For each row of `truth' ${\hat{p}_{{T}}^{H}}$, the matrix shows (in percentages) the fraction...

  • Table 4 prefit

    Data from Table 4 prefit

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    Pre-fit event yields in the dilepton signal regions and control regions. All uncertainties are included except the $k({t\bar {t}+{\geq }1b})$...

  • Table 4 postfit

    Data from Table 4 postfit

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    Post-fit event yields in the dilepton signal regions and control regions, after the inclusive fit in all channels. All uncertainties...

  • Table 5 prefit

    Data from Table 5 prefit

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    Pre-fit event yields in the single-lepton resolved and boosted signal regions and control regions. All uncertainties are included except the...

  • Table 5 postfit

    Data from Table 5 postfit

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    Post-fit event yields in the single-lepton resolved and boosted signal regions and control regions, after the inclusive fit in all...

  • Table 6

    Data from Table 6

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    Breakdown of the contributions to the uncertainties in $\mu$. The contributions from the different sources of uncertainty are evaluated after...

  • Table 10 dilepton

    Data from Table 10 dilepton

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    Fraction (in percentages) of signal events, after SR and CR selections, originating from $b\bar {b}$, $WW$ and other remaining Higgs...

  • Table 10 single-lepton

    Data from Table 10 single-lepton

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    Fraction (in percentages) of signal events, after SR and CR selections, originating from $b\bar {b}$, $WW$ and other remaining Higgs...

  • Table 11

    Data from Table 11

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    Predicted SM ${t\bar {t}H}$ cross-section in each of the five STXS ${\hat{p}_{{T}}^{H}}$ bins and signal acceptance times efficiency (including all...

  • Table 15

    Data from Table 15

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    Number of expected signal events before the fit, after each selection requirement applied to enter the dilepton channel $SR^{\geq 4j}_{\geq...

  • Table 16

    Data from Table 16

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    Number of expected signal events before the fit, after each selection requirement applied to enter the single-lepton channel resolved $SR^{\geq...

  • Table 17

    Data from Table 17

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    Number of expected signal events before the fit, after each selection requirement applied to enter the single-lepton channel boosted $SR_{boosted}$...

Version 2 modifications: Updates to number labelling of tables to match that of the final paper (tables were moved due to changes introduced following peer-review)

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