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Search for heavy Higgs Bosons A/H decaying to a top quark pair in pp collisions at √s=8 TeV with the ATLAS Detector

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • The ATLAS collaboration
Article number191803
<mark>Journal publication date</mark>9/11/2017
<mark>Journal</mark>Physical review letters
Issue number19
Number of pages20
Publication StatusPublished
<mark>Original language</mark>English


A 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 β, for mA/H > 500 GeV.