CMS-PAS-B2G-23-006

CMS-PAS-B2G-23-006
Search for heavy neutral Higgs bosons A and H in the $\mathrm{t\bar{t}}$ Z final state
CMS Collaboration
25 March 2024

Abstract: A direct search for heavy neutral Higgs bosons A and H in the $\mathrm{t\bar{t}}$ Z final state is presented, targeting the process $\mathrm{A}\rightarrow\mathrm{Z}\mathrm{H}$ with $\mathrm{H}\rightarrow\mathrm{t\bar{t}}$ . For the first time, the final state with decays of the Z boson to electrons or muons together with all-jet decays of the $\mathrm{t\bar{t}}$ system is considered. The analysis is conducted with 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. Model-independent upper limits on the cross section times branching ratio are derived for A and H boson masses up to 2100 GeV and 1900 GeV, respectively, assuming narrow width for both A and H. The results are also interpreted within two-Higgs-doublet models. Regions in parameter space with A boson masses between 550 and up to 1500 GeV, and H boson masses between 350 and up to 700 GeV, depending on the model parameters, are excluded at 95% confidence level, complementing and substantially extending the reach of previous searches.
Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to PLB. The superseded preliminary plots can be found here.

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