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A search for a heavy neutral Higgs boson, $A$, decaying into a $Z$ boson andanother heavy Higgs boson, $H$, is performed using a data sample correspondingto an integrated luminosity of 139 fb$^{-1}$ from proton-proton collisions at$\sqrt{s}$ = 13 TeV recorded by the ATLAS detector at the LHC. The searchconsiders the $Z$ boson decaying into electrons or muons and the $H$ boson intoa pair of $b$-quarks or $W$ bosons. The mass range considered is 230-800 GeVfor the $A$ boson and 130-700 GeV for the $H$ boson. The data are in goodagreement with the background predicted by the Standard Model, and therefore95% confidence-level upper limits for $\sigma \times B(A\rightarrow ZH) \timesB(H\rightarrow bb$ or $H\rightarrow WW)$ are set. The upper limits are in therange 0.0062-0.380 pb for the $H\rightarrow bb$ channel and in the range0.023-8.9 pb for the $H\rightarrow WW$ channel. An interpretation of theresults in the context of two-Higgs-Doublet models is also given.

european physical journal. c, particles and fields

Search for a heavy Higgs boson decaying into a $Z$ boson and another  heavy Higgs boson in the $\ell\ell bb$ and $\ell\ell WW$ final states in $pp$  collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector