Search for a CP-odd Higgs boson decaying into a heavy CP-even Higgs boson and a Z boson in the $$ {\ell}^{+}{\ell}^{-}t\overline{t} $$ and $$ \nu \overline{\nu}b\overline{b} $$ final states using 140 fb−1 of data collected with the ATLAS detector

A bstract A search for a heavy CP-odd Higgs boson, A , decaying into a Z boson and a heavy CP-even Higgs boson, H , is presented. It uses the full LHC Run 2 dataset of pp collisions at $$ \sqrt{s} $$ s = 13 TeV collected with the ATLAS detector, corresponding to an integrated luminosity of 140 fb − 1 . The search for A → ZH is performed in the $$ {\ell}^{+}{\ell}^{-}t\overline{t} $$ ℓ + ℓ − t t ¯ and $$ \nu \overline{\nu}b\overline{b} $$ ν ν ¯ b b ¯ final states and surpasses the reach of previous searches in different final states in the region with m H > 350 GeV and m A > 800 GeV. No significant deviation from the Standard Model expectation is found. Upper limits are placed on the production cross-section times the decay branching ratios. Limits with less model dependence are also presented as functions of the reconstructed m ( $$ t\overline{t} $$ t t ¯ ) and m ( $$ b\overline{b} $$ b b ¯ ) distributions in the $$ {\ell}^{+}{\ell}^{-}t\overline{t} $$ ℓ + ℓ − t t ¯ and $$ \nu \overline{\nu}b\overline{b} $$ ν ν ¯ b b ¯ channels, respectively. In addition, the results are interpreted in the context of two-Higgs-doublet models.

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