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| CMS-TOP-22-010 ; CERN-EP-2023-234 | ||
| Search for new Higgs bosons via same-sign top quark pair production in association with a jet in proton-proton collisions at $ \sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| 6 November 2023 | ||
| Phys. Lett. B 850 (2024) 138478 | ||
| Abstract: A search is presented for new Higgs bosons in proton-proton (pp) collision events in which a same-sign top quark pair is produced in association with a jet, via the $ \mathrm{p}\mathrm{p}\to \mathrm{t}\mathrm{H}/\mathrm{A} \to\mathrm{t}\mathrm{t}\overline{\mathrm{c}} $ and $ \mathrm{p}\mathrm{p}\to \mathrm{t}\mathrm{H}/\mathrm{A} \to\mathrm{t}\mathrm{t}\overline{\mathrm{u}} $ processes. Here, H and A represent the extra scalar and pseudoscalar boson, respectively, of the second Higgs doublet in the generalized two-Higgs-doublet model (g2HDM). The search is based on pp collision data collected at a center-of-mass energy of 13 TeV with the CMS detector at the LHC, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. Final states with a same-sign lepton pair in association with jets and missing transverse momentum are considered. New Higgs bosons in the 200--1000 GeV mass range and new Yukawa couplings between 0.1 and 1.0 are targeted in the search, for scenarios in which either H or A appear alone, or in which they coexist and interfere. No significant excess above the standard model prediction is observed. Exclusion limits are derived in the context of the g2HDM. | ||
| Links: e-print arXiv:2311.03261 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; Physics Briefing ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Representative Feynman diagram for $ \mathrm{t}\mathrm{t}\overline{\mathrm{q}} $ ($ \mathrm{q} = $ u, c) production through a new scalar (H) or pseudoscalar (A) Higgs boson. In this analysis, events with $ \mathrm{q}=\mathrm{q}' $ are considered. |
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Figure 2:
The pre-fit CvsL (left) and CvsB (right) distributions for the selected highest $ p_{\mathrm{T}} $ jet. The predictions for $ m_{\mathrm{A} } = $ 350 GeV with A-H interference assuming $ m_{\mathrm{A} } -m_{\mathrm{H}}= $ 50 GeV for $ \rho_{\mathrm{t}\mathrm{u}}= $ 1.0 (solid blue line) and $ \rho_{\mathrm{t}\mathrm{c}}= $ 1.0 (dashed red line) are also displayed. The numbers in square brackets represent the yields for each sample. The uncertainty bars on the points and the hatched bands represent the statistical uncertainties in the data and in the background predictions, respectively. Beneath each plot the ratio of data to predictions is shown. The uncertainty bars in the ratio plots include statistical uncertainties in the data and in the background predictions. |
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Figure 2-a:
The pre-fit CvsL distribution for the selected highest $ p_{\mathrm{T}} $ jet. The predictions for $ m_{\mathrm{A} } = $ 350 GeV with A-H interference assuming $ m_{\mathrm{A} } -m_{\mathrm{H}}= $ 50 GeV for $ \rho_{\mathrm{t}\mathrm{u}}= $ 1.0 (solid blue line) and $ \rho_{\mathrm{t}\mathrm{c}}= $ 1.0 (dashed red line) are also displayed. The numbers in square brackets represent the yields for each sample. The uncertainty bars on the points and the hatched bands represent the statistical uncertainties in the data and in the background predictions, respectively. Beneath the plot the ratio of data to predictions is shown. The uncertainty bars in the ratio plot include statistical uncertainties in the data and in the background predictions. |
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Figure 2-b:
The pre-fit CvsB distribution for the selected highest $ p_{\mathrm{T}} $ jet. The predictions for $ m_{\mathrm{A} } = $ 350 GeV with A-H interference assuming $ m_{\mathrm{A} } -m_{\mathrm{H}}= $ 50 GeV for $ \rho_{\mathrm{t}\mathrm{u}}= $ 1.0 (solid blue line) and $ \rho_{\mathrm{t}\mathrm{c}}= $ 1.0 (dashed red line) are also displayed. The numbers in square brackets represent the yields for each sample. The uncertainty bars on the points and the hatched bands represent the statistical uncertainties in the data and in the background predictions, respectively. Beneath the plot the ratio of data to predictions is shown. The uncertainty bars in the ratio plot include statistical uncertainties in the data and in the background predictions. |
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Figure 3:
Post-fit distributions of the BDT discriminants combining the categories $ \mathrm{e}^\pm\mathrm{e}^\pm $, $ \mu^\pm\mu^\pm $, and $ \mathrm{e}^\pm\mu^\pm $, for $ m_{\mathrm{A} }= $ 350 GeV with $ \rho_{\mathrm{t}\mathrm{u}}= $ 1.0 (left), and $ \rho_{\mathrm{t}\mathrm{c}}= $ 1.0 (right) with the A-H interference. The numbers in square brackets represent the yields for each sample. The uncertainty bars on the points represent the statistical uncertainties in the data. Beneath each plot the ratio of data to predictions is shown. The uncertainty bars in the ratio plots include statistical uncertainties in the data and the total uncertainty in the background predictions, and the hatched bands represent the total uncertainty in the background predictions. |
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Figure 3-a:
Post-fit distribution of the BDT discriminants combining the categories $ \mathrm{e}^\pm\mathrm{e}^\pm $, $ \mu^\pm\mu^\pm $, and $ \mathrm{e}^\pm\mu^\pm $, for $ m_{\mathrm{A} }= $ 350 GeV with $ \rho_{\mathrm{t}\mathrm{u}}= $ 1.0 with the A-H interference. The numbers in square brackets represent the yields for each sample. The uncertainty bars on the points represent the statistical uncertainties in the data. Beneath the plot the ratio of data to predictions is shown. The uncertainty bars in the ratio plot include statistical uncertainties in the data and the total uncertainty in the background predictions, and the hatched bands represent the total uncertainty in the background predictions. |
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Figure 3-b:
Post-fit distribution of the BDT discriminants combining the categories $ \mathrm{e}^\pm\mathrm{e}^\pm $, $ \mu^\pm\mu^\pm $, and $ \mathrm{e}^\pm\mu^\pm $, for $ m_{\mathrm{A} }= $ 350 GeV with $ \rho_{\mathrm{t}\mathrm{c}}= $ 1.0 with the A-H interference. The numbers in square brackets represent the yields for each sample. The uncertainty bars on the points represent the statistical uncertainties in the data. Beneath the plot the ratio of data to predictions is shown. The uncertainty bars in the ratio plot include statistical uncertainties in the data and the total uncertainty in the background predictions, and the hatched bands represent the total uncertainty in the background predictions. |
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Figure 4:
Observed and expected 95% CL upper limits on the signal strength as functions of $ m_{\mathrm{A} } $ for g2HDM using different coupling assumptions: $ \rho_{\mathrm{t}\mathrm{u}} = $ 0.1, 0.4, 1.0 (left) and $ \rho_{\mathrm{t}\mathrm{c}} = $ 0.1, 0.4, 1.0 (right) without interference, for the combination of the $ \mathrm{e}^\pm\mathrm{e}^\pm $, $ \mu^\pm\mu^\pm $, and $ \mathrm{e}^\pm\mu^\pm $ categories. 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. |
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Figure 4-a:
Observed and expected 95% CL upper limits on the signal strength as functions of $ m_{\mathrm{A} } $ for g2HDM using different coupling assumptions: $ \rho_{\mathrm{t}\mathrm{u}} = $ 0.1, 0.4, 1.0 without interference, for the combination of the $ \mathrm{e}^\pm\mathrm{e}^\pm $, $ \mu^\pm\mu^\pm $, and $ \mathrm{e}^\pm\mu^\pm $ categories. 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. |
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Figure 4-b:
Observed and expected 95% CL upper limits on the signal strength as functions of $ m_{\mathrm{A} } $ for g2HDM using different coupling assumptions: $ \rho_{\mathrm{t}\mathrm{c}} = $ 0.1, 0.4, 1.0 without interference, for the combination of the $ \mathrm{e}^\pm\mathrm{e}^\pm $, $ \mu^\pm\mu^\pm $, and $ \mathrm{e}^\pm\mu^\pm $ categories. 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. |
png pdf |
Figure 5:
Observed and expected 95% CL upper limits on the signal strength as functions of $ m_{\mathrm{A} } $ for g2HDM using different coupling assumptions: $ \rho_{\mathrm{t}\mathrm{u}} = $ 0.1, 0.4, 1.0 (left) and $ \rho_{\mathrm{t}\mathrm{c}} = $ 0.1, 0.4, 1.0 (right) with A-H interference assuming $ m_{\mathrm{A} } - m_{\mathrm{H}} = $ 50 GeV, for the combination of the $ \mathrm{e}^\pm\mathrm{e}^\pm $, $ \mu^\pm\mu^\pm $, and $ \mathrm{e}^\pm\mu^\pm $ categories. 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. |
png pdf |
Figure 5-a:
Observed and expected 95% CL upper limits on the signal strength as functions of $ m_{\mathrm{A} } $ for g2HDM using different coupling assumptions: $ \rho_{\mathrm{t}\mathrm{u}} = $ 0.1, 0.4, 1.0 with A-H interference assuming $ m_{\mathrm{A} } - m_{\mathrm{H}} = $ 50 GeV, for the combination of the $ \mathrm{e}^\pm\mathrm{e}^\pm $, $ \mu^\pm\mu^\pm $, and $ \mathrm{e}^\pm\mu^\pm $ categories. 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. |
png pdf |
Figure 5-b:
Observed and expected 95% CL upper limits on the signal strength as functions of $ m_{\mathrm{A} } $ for g2HDM using different coupling assumptions: $ \rho_{\mathrm{t}\mathrm{c}} = $ 0.1, 0.4, 1.0 with A-H interference assuming $ m_{\mathrm{A} } - m_{\mathrm{H}} = $ 50 GeV, for the combination of the $ \mathrm{e}^\pm\mathrm{e}^\pm $, $ \mu^\pm\mu^\pm $, and $ \mathrm{e}^\pm\mu^\pm $ categories. 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. |
png pdf |
Figure 6:
Observed 95% CL upper limit on the signal strength as a function of $ m_{\mathrm{A} } $ and $ \rho_{\mathrm{t}\mathrm{u}} $ (left) and $ \rho_{\mathrm{t}\mathrm{c}} $ (right) for g2HDM without the A-H interference, for the combination of the $ \mathrm{e}^\pm\mathrm{e}^\pm $, $ \mu^\pm\mu^\pm $, and $ \mathrm{e}^\pm\mu^\pm $ categories. The color axis represents the observed upper limit on the signal strength. Expected (dashed lines) and observed (solid lines) exclusion contours are also shown. |
png pdf |
Figure 6-a:
Observed 95% CL upper limit on the signal strength as a function of $ m_{\mathrm{A} } $ and $ \rho_{\mathrm{t}\mathrm{u}} $ for g2HDM without the A-H interference, for the combination of the $ \mathrm{e}^\pm\mathrm{e}^\pm $, $ \mu^\pm\mu^\pm $, and $ \mathrm{e}^\pm\mu^\pm $ categories. The color axis represents the observed upper limit on the signal strength. Expected (dashed lines) and observed (solid lines) exclusion contours are also shown. |
png pdf |
Figure 6-b:
Observed 95% CL upper limit on the signal strength as a function of $ m_{\mathrm{A} } $ and $ \rho_{\mathrm{t}\mathrm{c}} $ for g2HDM without the A-H interference, for the combination of the $ \mathrm{e}^\pm\mathrm{e}^\pm $, $ \mu^\pm\mu^\pm $, and $ \mathrm{e}^\pm\mu^\pm $ categories. The color axis represents the observed upper limit on the signal strength. Expected (dashed lines) and observed (solid lines) exclusion contours are also shown. |
png pdf |
Figure 7:
Observed 95% CL upper limit on the signal strength as a function of $ m_{\mathrm{A} } $ and $ \rho_{\mathrm{t}\mathrm{u}} $ (left) and $ \rho_{\mathrm{t}\mathrm{c}} $ (right) for g2HDM signal model with the A-H interference, for the combination of the $ \mathrm{e}^\pm\mathrm{e}^\pm $, $ \mu^\pm\mu^\pm $, and $ \mathrm{e}^\pm\mu^\pm $ categories. The color axis represents the observed upper limit on the signal strength. Expected (dashed lines) and observed (solid lines) exclusion contours are also shown. |
png pdf |
Figure 7-a:
Observed 95% CL upper limit on the signal strength as a function of $ m_{\mathrm{A} } $ and $ \rho_{\mathrm{t}\mathrm{u}} $ for g2HDM signal model with the A-H interference, for the combination of the $ \mathrm{e}^\pm\mathrm{e}^\pm $, $ \mu^\pm\mu^\pm $, and $ \mathrm{e}^\pm\mu^\pm $ categories. The color axis represents the observed upper limit on the signal strength. Expected (dashed lines) and observed (solid lines) exclusion contours are also shown. |
png pdf |
Figure 7-b:
Observed 95% CL upper limit on the signal strength as a function of $ m_{\mathrm{A} } $ and $ \rho_{\mathrm{t}\mathrm{c}} $ for g2HDM signal model with the A-H interference, for the combination of the $ \mathrm{e}^\pm\mathrm{e}^\pm $, $ \mu^\pm\mu^\pm $, and $ \mathrm{e}^\pm\mu^\pm $ categories. The color axis represents the observed upper limit on the signal strength. Expected (dashed lines) and observed (solid lines) exclusion contours are also shown. |
| Tables | |
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Table 1:
Input variables of the BDT. Jets and leptons are ordered by $ p_{\mathrm{T}} $. |
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Table 2:
Summary of systematic uncertainties for $ \rho_{\mathrm{t}\mathrm{c}}= $ 0.4 and $ m_{\mathrm{A} } = $ 350 GeV with A-H interference assuming $ m_{\mathrm{A} } -m_{\mathrm{H}}= $ 50 GeV. The first column indicates the source of uncertainty. The second column specifies whether the shape of the fit discriminant is affected by the nuisance parameter (checkmark) or not (dash). The impact in percent of these nuisance parameters on the pre-fit expected event yields is displayed in the third column. This column is subdivided into three event categories representing the analysis channels. The percentage impacts are given as a range of values representing the minimum and maximum differences obtained in the different bins of the BDT distribution through the four data-taking periods. The numbers for the normalization component of the nonprompt lepton background represent the uncertainties used for each data-taking period. Whether or not a nuisance parameter is taken correlated across years and categories is specified in the last two columns. The luminosity and jet flavor identification nuisances are only partially correlated across years. |
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Table 3:
Observed (expected) lower limits on $ m_{\mathrm{A} } $ at 95% CL. For the scenario without interference, the limits on $ m_{\mathrm{H}} $ and $ m_{\mathrm{A} } $ are the same. |
| Summary |
| A search for new Yukawa couplings of the top quark in models with additional Higgs bosons in proton-proton collisions at a center-of-mass energy of 13 TeV has been presented. The process considered is the production of same-sign top quark pairs associated with an up or a charm quark, and resulting in a final state containing two same-sign leptons and jets. No significant excess above the background prediction is observed. When no interference between the pseudoscalar (A) and scalar (H) Higgs bosons is assumed, A or H bosons with masses below 920 GeV and 1000 GeV are excluded at the 95% confidence level (CL) for coupling values $ \rho_{\mathrm{t}\mathrm{u}} = $ 0.4 and 1.0, respectively, while all other extra Yukawa couplings are assumed to be zero. Similarly, without interference between H and A, and assuming a coupling value of $ \rho_{\mathrm{t}\mathrm{c}} = $ 1.0, A or H bosons with masses below approximately 770 GeV are excluded at the 95% CL. Under the assumption that A and H interfere in the scenario with a mass difference of $ m_{\mathrm{A} } - m_{\mathrm{H}} = $ 50 GeV, the pseudoscalar Higgs boson is excluded for $ m_{\mathrm{A} } $ values below 1000 GeV when considering coupling values $ \rho_{\mathrm{t}\mathrm{u}} > $ 0.4. Furthermore, assuming $ \rho_{\mathrm{t}\mathrm{c}} = $ 0.4, the exclusion limit for A is $ m_{\mathrm{A} } = $ 340 GeV, whereas assuming $ \rho_{\mathrm{t}\mathrm{c}} = $ 1.0, the limit extends to $ m_{\mathrm{A} } = $ 810 GeV at 95% CL. These results represent the first search based on the generalized two-Higgs-doublet model considering A-H interference. |
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