Search for Heavy Higgs Bosons A/H Decaying to a Top Quark Pair in pp Collisions at √s= 8 TeV with the ATLAS Detector

ATLAS Collaboration

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Abstract

A search for heavy pseudoscalar (A) and scalar (H) Higgs bosons decaying into a top quark pair (t¯t) 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 t¯t 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 t¯t 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, tanβ, for mA/H>500  GeV.
Original languageEnglish
Article number191803
JournalPhysical Review Letters
Volume119
DOIs
Publication statusPublished - 9 Nov 2017

Bibliographical note

30 pages in total, author list starting page 14, 3 figures, 3 tables, published version. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2016-04/

Keywords

  • hep-ex

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