Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 11: Higgs: bosonic decays and quantum numbers

T 11.3: Talk

Monday, March 30, 2020, 17:00–17:15, H-HS XII

Background modeling in the measurements of differential Higgs boson cross sections in the diphoton channel with the ATLAS detector — •Nils Gillwald — DESY, Hamburg, Germany

Since the discovery of the Higgs boson in July 2012, efforts have been underway to measure its properties as precisely as possible. An important part of these efforts is the differential measurements of the H → γγ cross section. Such measurements of different spectra of kinematic and event observables offer access to e.g. properties of perturbative QCD, the spin and CP nature of the Higgs boson, bottom and charm Yukawa couplings and new heavy particles coupling to the Higgs boson. The dominating uncertainty for the latest full LHC Run 2 results in the measurement of H → γγ differential cross sections is the estimation of the spurious signal, i.e. the potential bias on the measurement due to the background modeling. Improving the estimate on the spurious signal, and thus the background modeling, is therefore of utmost importance for a precise measurement. In this talk, I present the work in progress on the improvements of the background modeling. This includes a discussion on shortcomings as well as potential further improvements for Run 2 and beyond.