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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 36.1 fb$^{-1}$ from proton-proton collisions at$\sqrt{s} = 13$ TeV recorded in 2015 and 2016 by the ATLAS detector at theLarge Hadron Collider. The search considers the $Z$ boson decaying to electronsor muons and the $H$ boson into a pair of $b$-quarks. No evidence for theproduction of an $A$ boson is found. Considering each production processseparately, the 95% confidence-level upper limits on the $pp\rightarrowA\rightarrow ZH$ production cross-section times the branching ratio$H\rightarrow bb$ are in the range of 14-830 fb for the gluon-gluon fusionprocess and 26-570 fb for the $b$-associated process for the mass ranges130-700 GeV of the $H$ boson and process for the mass ranges 130-700 GeV of the$H$ boson and 230-800 GeV of the $A$ boson. The results are interpreted in thecontext of the two-Higgs-doublet model.

physics letters b

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