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T: Fachverband Teilchenphysik

T 45: Higgs Physics V (HH and Trilinear Coupling)

T 45.7: Vortrag

Mittwoch, 2. April 2025, 17:45–18:00, ZHG104

Search for Higgs Boson Pair Production in Multi-Lepton Final States with the ATLAS Detector — Anamika Aggarwal, Volker Büscher, 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.
This talk will give an overview about the analysis strategy, which relies on neural networks to distinguish the signal processes from the sum of all SM backgrounds. In addition, preparations for the Run 2 + partial Run 3 analysis, based on a combined dataset of about 300 fb⁻¹, will be presented, as well as a first look at Run 3 data and comparisons to Monte Carlo.