Search for heavy neutral Higgs bosons A and H in the $\mathrm{t\bar{t}}$Z channel in proton-proton collisions at 13 TeV

The CMS collaboration
CMS-B2G-23-006, 2024.

Abstract
A direct search for new heavy neutral Higgs bosons A and H in the $\mathrm{t\bar{t}}$Z channel is presented, targeting the process pp $\to$ A $\to$ ZH with H $\to$$\mathrm{t\bar{t}}$. For the first time, the channel with decays of the Z boson to muons or electrons in association with all-hadronic decays of the $\mathrm{t\bar{t}}$ system is targeted. The analysis uses proton-proton collision data collected at the CERN LHC with the CMS experiment at $\sqrt{s}$ = 13 TeV, which correspond to an integrated luminosity of 138 fb$^{-1}$. No signal is observed. Upper limits on the product of the cross section and branching fractions are derived for narrow resonances A and H with masses up to 2100 and 2000 GeV, respectively, assuming A boson production through gluon fusion. The results are also interpreted within two-Higgs-doublet models, complementing and substantially extending the reach of previous searches.

  • Figure 4 SR Distributions MA1000 MH350

    Data from Figure 4, located on page 10

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    Distributions of p_T(Z) × ∆m in the SR after the fit to data with a (mA , mH) signal hypothesis...

  • Figure 4 SR Distributions MA1000 MH850

    Data from Figure 4, located on page 10

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    Distributions of p_T(Z) × ∆m in the SR after the fit to data with a (mA , mH) signal hypothesis...

  • Figure 5 (Expected Limits)

    Data from Figure 5, located on page 11

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    Expected 95% CL upper limits on the production cross section times branching ratio of the A → ZH → Ztt...

  • Figure 5 (Observed Limits)

    Data from Figure 5, located on page 11

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    Observed 95% CL upper limits on the production cross section times branching ratio of the A → ZH → Ztt...

  • Figure 6 Observed tanb=0.5

    Data from Figure 6, located on page 12

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    Median expected (dashed lines) and observed (filled contours) 95% CL exclusion regions in the (mH, mA) parameter space of the...

  • Figure 6 Observed tanb=1.0

    Data from Figure 6, located on page 12

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    Median expected (dashed lines) and observed (filled contours) 95% CL exclusion regions in the (mH, mA) parameter space of the...

  • Figure 6 Observed tanb=1.5

    Data from Figure 6, located on page 12

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    Median expected (dashed lines) and observed (filled contours) 95% CL exclusion regions in the (mH, mA) parameter space of the...

  • Figure 6 Expected tanb=0.5

    Data from Figure 6, located on page 12

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    Median expected (dashed lines) and observed (filled contours) 95% CL exclusion regions in the (mH, mA) parameter space of the...

  • Figure 6 Expected tanb=1.0

    Data from Figure 6, located on page 12

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    Median expected (dashed lines) and observed (filled contours) 95% CL exclusion regions in the (mH, mA) parameter space of the...

  • Figure 6 Expected tanb=1.5

    Data from Figure 6, located on page 12

    10.17182/hepdata.150023.v1/t10

    Median expected (dashed lines) and observed (filled contours) 95% CL exclusion regions in the (mH, mA) parameter space of the...

  • Figure 7 (left) Expected

    Data from Figure 7 (left), located on page 12

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    Median expected (dashed lines) and observed (filled contours) 95% CL exclusion regions in the type-II 2HDM (tan β, mA) parameter...

  • Figure 7 (left) Observed

    Data from Figure 7 (left), located on page 12

    10.17182/hepdata.150023.v1/t12

    Median expected (dashed lines) and observed (filled contours) 95% CL exclusion regions in the type-II 2HDM (tan β, mA) parameter...

  • Figure 7 (right) Expected

    Data from Figure 7 (right), located on page 12

    10.17182/hepdata.150023.v1/t13

    Median expected (dashed lines) and observed (filled contours) 95% CL exclusion regions in the type-II 2HDM (tanβ, cos(β−α)) parameter space...

  • Figure 7 (right) Observed

    Data from Figure 7 (right), located on page 12

    10.17182/hepdata.150023.v1/t14

    Median expected (dashed lines) and observed (filled contours) 95% CL exclusion regions in the type-II 2HDM (tanβ, cos(β−α)) parameter space...

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