Bonn 2020 – scientific programme
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T: Fachverband Teilchenphysik
T 96: Higgs: Decay into fermions III
T 96.2: Talk
Friday, April 3, 2020, 11:15–11:30, H-HS X
modelling of the W+jets and tt backgrounds for the VH, H → bb analysis — •Simona Gargiulo, Stephen Jiggins, and Christian Weiser for the ATLAS collaboration — Albert-Ludwigs-Universitaet Freiburg
The measurement of the decay of the Higgs boson into a bb pair produced in association with a W or Z boson with the ATLAS detector is presented. The analysed dataset corresponds to an integrated luminosity of 139 fb−1 collected in proton-proton collisions in Run 2 of the Large Hadron Collider at a centre-of-mass energy of 13 TeV. Final states with 0, 1 and 2 charged leptons are considered targeting the decay channels Z → νν, W → lν and Z → l+ l−. The tt and the W+jets processes are two leading backgrounds and their uncertainties contribute significantly to the overall systematic uncertainty on the signal strength. The focus of this talk will be on the estimation of the systematic uncertainties on the theoretical prediction of these two backgrounds. In this contex, a new technique to derive the shape uncertainties based on an n-dimensional reweighting approach is explored. A Boosted Decision Tree (BDT) is trained to separate the nominal Monte Carlo prediction from the alternative one for both backgrounds. The parametrized ratio between the nominal and the alternative classifier responses is used to map the nominal prediction to look like the alternative. The potential of this methodology lies in the ability to simultaneously map the two generators into each other in all n-dimensions of the analysis and examples of this will be presented.