Aachen 2019 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 52: Higgs-Zerfälle in Fermionen II

T 52.4: Vortrag

Mittwoch, 27. März 2019, 16:45–17:00, H04

Modelling of the W+jets background in the 1-lepton channel for the VH, Hbb analysis — •Simona Gargiulo, Stephen Jiggins, and Christian Weiser — Albert-Ludwigs-Universität Freiburg

The observation 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 79.8 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, Wlν and Zl+ l.

The W+jets process is one of the leading backgrounds in the 1-lepton channel and its uncertainty contributes significantly to the overall systematic uncertainty on the signal strength. The focus of this talk will be on the estimation of the systematic uncertainties of the theoretical prediction of the W+jets background in the 1-lepton channel. This estimation relies on generator studies with varied settings and on the comparison between different generators.

Furthermore, new techniques are explored to reduce the W+jets systematic on the vector boson transverse momentum, by making use of control regions that allow a better determination of kinematic properties in these events.

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