Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 3: Higgs: Produktion und Zerfälle

T 3.5: Talk

Monday, March 25, 2019, 17:00–17:15, H04

Studies on systematic uncertainties for the ttHbb ATLAS analysis at 13 TeV — •Filip Nechansky — DESY Zeuthen

The discovery of the Higgs boson in 2012 marked an important point in modern science, confirming more than 50 years old theoretical prediction. All measurements so far suggest that the properties of the new found boson are in agreement with the Standard model prediction. Since it is known that SM is not a complete theory, a hunt is on to find any deviation which could point to a new theory and the untouched ground around the Higgs boson is a promising area to find it. Therefore, it is important to probe all its properties as precisely as possible.

Due to its mass, the coupling of the top quark to Higgs boson is the strongest. Since top is too heavy to be produced by a Higgs decay, the most direct way to study its coupling is in a production of a top quark pair where the top radiates a Higgs boson. Analysis of such process at ATLAS is divided based on the decay products of the top quarks and the Higgs. This talk will report on a signature where the Higgs boson decays into two b-quarks, a channel which is not well established because of a difficult background modelling. The measurement was done with Run 2 data at 13 TeV proton collisions. Specifically, sensitivity to different systematic uncertainties will be discussed.