Würzburg 2018 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 10: Higgs: Erweiterte Modelle I
T 10.6: Vortrag
Montag, 19. März 2018, 17:15–17:30, Z6 - HS 0.004
Interference modelling of the heavy Higgs boson decaying into tt final states at the ATLAS experiment — Katharina Behr1, •Yu-Heng Chen1, Klaus Mönig1, and Jike Wang2 — 1DESY, Hamburg, Germany — 2Heidelberg PI, Heidelberg, Germany
The first search for heavy (pseudo)scalar Higgs bosons A/H decaying into a top-antitop-quark pair (tt) including interference effects at the Large Hadron Collider (LHC) has been performed by the ATLAS collaboration on 20.3 fb−1 of √s=8 TeV proton-proton collision data. The interference between the signal and the dominant background from standard model tt production significantly distorts the signal shape from a simple Breit-Wigner peak to a peak-dip structure; hence, the potential to observe such a signal relies on a precise understanding and modelling of the lineshape of both the signal and the background.
The contribution introduces the major challenges and techniques including model implementation, fitting and efficient MC signal sample production/recycling via reweighting used at the ATLAS experiment. The results are interpreted in terms of the framework of the Type-II two-Higgs-doublet models (2HDM) as well as an extension to dark matter models.