Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 100: Higgs-Boson 8 (BSM-Zerfälle)

T 100.7: Vortrag

Donnerstag, 30. März 2017, 18:20–18:35, JUR 3

Search for massive (pseudo)scalar states A/H decaying to tt with interference at the ATLAS experiment — Katharina Behr, •Yu-Heng Chen, Klaus Mönig, and Jike Wang — DESY, Germany

The search for new neutral TeV scale (pseudo)scalar particles is well-motivated by a wide range of theories beyond the Standard Model (BSM) which include an extra Higgs doublet such as the Minimal Supersymmetric Standard Model (MSSM). Final states with a top-antitop-quark pair (tt) provide good sensitivity especially for low values of tanβ (the ratio of the vacuum expectation values of the two Higgs fields), a parameter range that is not accessible by most searches in other final states.

However, strong interference effects between the signal and the Standard Model tt background distort the signal shape from a simple Breit-Wigner peak to a peak-dip structure and reduce the sensitivity of established search strategies for tt resonances; therefore, a new strategy has to be adopted. We present the first search with interference effects taken into consideration. We describe the search strategies adopted for the analyses of proton-proton collisions at √s=8 TeV and 13 TeV. The results are interpreted in terms of a type-II 2HDM model.