Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 89: Higgs Boson: Decay in Fermions 2
T 89.6: Vortrag
Donnerstag, 24. März 2022, 17:30–17:45, T-H20
Search for Higgs-boson pair production in the bbℓℓ+ETmiss final state with the ATLAS detector — •Benjamin Rottler, Benoit Roland, and Markus Schumacher — Albert-Ludwigs-Universität Freiburg
The determination of the triple Higgs-boson self-coupling λ is one of the key goals of the physics program at current and future colliders. It will allow to reconstruct the Higgs potential. The self-coupling can be accessed via non-resonant Higgs-boson pair production, which can happen at the LHC via the destructively interfering top-loop and Higgs self-interaction diagrams.
The goal of this analysis is to measure the cross-section of the non-resonant Higgs-boson pair production σHH and the Higgs-boson self-coupling λ using the full Run-2 dataset collected by the ATLAS experiment, corresponding to an integrated luminosity of ∼139 fb−1 at √s = 13 TeV. This is done by considering the bbℓℓ+ETmiss final state, which combines the high branching ratio of the H→ bb decay and the good efficiency of lepton triggers. Our focus is on a combined search for the HH→ bb(WW → 2ℓ 2ν), HH→ bb(ττ→ 2ℓ 4ν) and HH→ bb(ZZ → 2ℓ 2ν / 2ℓ 2q) processes.
A multi-class deep neural network (NN) is used to separate signal and background processes on top of a loose preselection. The shape of the NN output distribution will be used in the statistical analysis. I will present the results of the σHH and λ measurements. I will also discuss the application of parametrized NNs (pNN) for the λ measurement, which allows to train a combined NN for multiple λ values.