Çetin, Serkant Ali2021-04-082021-04-082017-11-100031-9007https://hdl.handle.net/11411/3511https://doi.org/10.1103/PhysRevLett.119.191803A search for heavy pseudoscalar (A) and scalar (H) Higgs bosons decaying into a top quark pair (tt¯) has been performed with 20.3??fb-1 of proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider at a center-of-mass energy s=8??TeV. Interference effects between the signal process and standard model tt¯ production, which are expected to distort the signal shape from a single peak to a peak-dip structure, are taken into account. No significant deviation from the standard model prediction is observed in the tt¯ invariant mass spectrum in final states with an electron or muon, large missing transverse momentum, and at least four jets. The results are interpreted within the context of a type-II two-Higgs-doublet model. Exclusion limits on the signal strength are derived as a function of the mass mA/H and the ratio of the vacuum expectation values of the two Higgs fields, tan?, for mA/H>500??GeV.eninfo:eu-repo/semantics/openAccessp p: colliding beamstop: pair productionHiggs particle: heavyHiggs particle: hadronic decayinterference: effecttransverse momentum: missing-energyp p: scatteringATLASCERN LHC Collmass spectrum: (2top)Higgs particle: pseudoscalar particlestructuresupersymmetry: parameter spacemass dependencefinal state: ((n)jet lepton)Higgs particle: doubletexperimental results8000 GeV-cmsArticle2-s2.0-8503407028510.1103/PhysRevLett.119.19180329219511Q1WOS:000414743000003