Search for a heavy Higgs boson decaying into a ℤ boson and another heavy Higgs boson in the ℓℓbb final state in pp collisions at √s=13 TeV with the ATLAS detector

Rimoldi, Marco; Mullier, Geoffrey; Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Meloni, Federico; Beck, Hans Peter; Ereditato, Antonio (2018). Search for a heavy Higgs boson decaying into a ℤ boson and another heavy Higgs boson in the ℓℓbb final state in pp collisions at √s=13 TeV with the ATLAS detector. Physics letters. B, 783, pp. 392-414. Elsevier 10.1016/j.physletb.2018.07.006

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A search for a heavy neutral Higgs boson, A, decaying into a Z boson and another heavy Higgs boson, H, is performed using a data sample corresponding to an integrated luminosity of 36.1 fb⁻¹from proton–proton collisions at √s=13 TeV recorded in 2015 and 2016 by the ATLAS detector at the Large Hadron Collider. The search considers the Z boson decaying to electrons or muons and the H boson into a pair of b-quarks. No evidence for the production of an A boson is found. Considering each production process separately, the 95% confidence-level upper limits on the pp → A → ZH production cross-section times the branching ratio H → bb are in the range of 14–830 fb for the gluon–gluon fusion process and 26–570 fb for the b-associated 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 the context of two-Higgs-doublet models.

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