Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 89: Higgs Boson: Decay in Fermions 2

T 89.5: Vortrag

Donnerstag, 24. März 2022, 17:15–17:30, T-H20

Search for Higgs Boson Pair Production in Multi-Lepton Final States with the ATLAS Detector — Volker Büscher, Antoine Laudrain, Christian Schmitt, •Niklas Schmitt, and Duc Bao Ta — Johannes Gutenberg-Universität, Mainz

After the discovery of the Higgs boson in 2012 at the LHC, many of its properties have already been determined precisely using data of an integrated luminosity of 139 fb⁻¹. However, one of the biggest challenges in this field remains the measurement of the coupling of the Higgs boson to itself. It allows for a deep insight into the real shape of the Higgs potential and hence has a big impact on the understanding of fundamental interactions not only at the electroweak scale. In order to constrain the trilinear self-coupling, the Di-Higgs production cross section is measured. While decay modes including b-quarks typically have larger branching fractions, leptonic final states are generally much cleaner and have less SM background. Accordingly, probing this channel as a complement to bb analyses will be very promising.
Because of the small branching ratio and the large number of different SM backgrounds, it is difficult to investigate every leptonic HH decay mode individually. For this reason, dedicated neural networks in the 2,3 and 4 lepton final states have been trained to distinguish all re- levant signal processes against the sum of all backgrounds. This talk will introduce the analysis strategy and give an overview on the performance of the multi-lepton channel compared to other decay modes.