Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 83: Search for new particles IV

T 83.8: Talk

Thursday, April 2, 2020, 18:15–18:30, L-2.017

A data-driven estimate of the ZZ background in the search for high mass Higgs bosons — •fang-ying tsai for the ATLAS collaboration — DESY

An additional Higgs boson is predicted by many models such as the two-Higgs-doublet model (2HDM). This talk will mainly focus on a data-driven method used to estimate the dominant ZZ background in the search for X → ZZ → ℓ⁺ ℓ⁻+ MET. Currently, the ZZ → ℓ⁺ ℓ⁻+ νν background is estimated from simulated MC samples and it contributes the largest systematic uncertainties to the analysis. The idea of the Zγ methodology is to make use of the similarity of the ZZ and Zγ processes, especially in the regions where the mass difference between the Z and the photon does not matter. The ZZ/Zγ cross-section ratio is calculated in bins of the νν pt and γ pt and applied to the Zγ events in data, together with a correction of the photon reconstruction efficiency to mimic the production of the ZZ background. The presented studies use the full ATLAS Run 2 data sample (2015-2018) in proton-proton collisions at √s = 13 TeV centre-of-mass energy, corresponding to 139 fb⁻¹.