SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 109: Higgs, Di-Higgs III

T 109.6: Vortrag

Donnerstag, 23. März 2023, 17:05–17:20, HSZ/0105

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

After the discovery of the Higgs boson in 2012 at the LHC, many of its properties have already been determined precisely using 139 fb⁻¹ of proton-proton collisions at √s = 13 TeV. 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.
Dedicated neural networks in the 2,3 and 4 lepton final states have been trained to distinguish all relevant signal processes against the sum of all SM backgrounds. This talk will highlight the performance of these multi-lepton channels compared to other HH decay modes and also introduces a regression network used for probing the sensitivity to the Higgs boson self-coupling. In addition, a first look into Run 3 data, as well as projections for the full Run 3 dataset, are presented.