Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 47: Higgs 2 (ttH & tH production)

T 47.8: Talk

Tuesday, March 5, 2024, 17:45–18:00, Geb. 30.41: HS 2

Investigation of the ttH(bb) Reconstruction in Events with High Higgs Boson Momentum at the ATLAS Experiment — •Doga Elitez, Lucia Masetti, Jessica Höfner, Frederic Fischer, and Eftychia Tzovara — Johannes-Gutenberg Universität Mainz, Mainz, Germany

The coupling of the Higgs boson to the top quark is very sensitive to effects of the physics beyond the Standard Model (BSM) and the most favorable production mode for direct measurement of the top Yukawa coupling is the Higgs production in association with a pair of top quarks, ttH. The decay to two bottom quarks (H to bb) has the largest branching fraction of about 58%. This analysis aims at events in which one of the top quarks decays semi-leptonically and produces an electron or a muon. The so-called boosted topology targets events containing a Higgs boson produced at high transverse momentum, whose decay products are contained in a large radius jet. In this analysis, two methods to identify and reconstruct the Higgs boson decay collimated in a single large-radius jet are compared. Additionally, methods to improve background rejection and event reconstruction are presented.

Keywords: Higgs boson; Top quark; ATLAS Experiment