Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 96: Higgs: Decay into fermions III

T 96.4: Talk

Friday, April 3, 2020, 11:45–12:00, H-HS X

Search for Higgs-boson pair production in the bbℓℓ+MET decay channel 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 measured via non-resonant Higgs-boson pair production, which can happen at the LHC via the destructively interfering top-loop and Higgs self-interaction diagrams. Furthermore, this process is sensitive to new heavy particles.

The goal of this analysis is to measure the cross-section of the non-resonant Higgs-boson pair production σ_HH using the full Run-2 dataset collected by the ATLAS experiment corresponding to an integrated luminosity of ∼140 fb⁻¹ at √s = 13 TeV. This is done via the bbℓℓ+MET final state, which combines the high branching ratio of the H→ bb decay and the good trigger 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) processes.

Modern machine learning (ML) technologies like multi-class deep neural networks will be used to separate background and signal processes. The ML classifier will be trained on top of a loose preselection. The statistical analysis will use the shape information provided by the output distribution of the ML classifier in order to extract the HH cross-section.