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

The ATLAS collaboration
Aad, Georges , Abbott, Brad , Abbott, Dale Charles , Abed Abud, Adam , Abeling, Kira , Abhayasinghe, Deshan Kavishka , Abidi, Syed Haider , Abouzeid, Ossama , Abraham, Nicola , Abramowicz, Halina
Eur.Phys.J.C 81 (2021) 396, 2021.

Abstract (data abstract)
CERN-LHC. Search for a heavy Higgs boson, A, decaying into a Z boson and another heavy Higgs boson, H, in the llbb or llWW final state using a data sample corresponding to an integrated luminosity of 139/fb from proton-proton collisions at sqrt(s)=13 TeV recorded with the ATLAS detector. The final states contain electron-electron-b-b or muon-muon-b-b for llbb and electron-electron-4q or muon-muon-4q for llWW final states respectively. A summary of the selection criteria is given in Table 1, page 8 of the preprint.

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