Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 47: Higgs 2 (ttH & tH production)

T 47.2: Vortrag

Dienstag, 5. März 2024, 16:15–16:30, Geb. 30.41: HS 2

Reconstruction of the semi-leptonic tt(H→ WW^*) final state — Arnulf Quadt, •Ireas Tom Raschke, Baptiste Ravina, and Chris Scheulen — Georg-August-Universität, II. Physikalisches Institut, Göttingen, Germany

This talk will cover the analysis of tt(H→ WW^*) events in which the top quark pair decays fully hadronically and the W bosons decay semi-leptonically. The analysis uses the full ATLAS Run 2 dataset. The ttH process allows to probe the Yukawa coupling of the top quark directly, and has previously been studied in multi-lepton final states and in the boosted tt(H→ bb) channel. The semi-leptonic H→ WW^* channel has not yet been explored.

The reason for this is the difficulty to reconstruct the event from the many jets in the final state. Classical algorithms that use jet kinematics are not suited for this channel. Hence, a modern neural network approach (SPANet) is implemented. It is expected to increase the background suppression. The leptonic W boson is then reconstructed from the single lepton in the event and the missing transverse energy using neutrino weighting.

Keywords: Event Reconstruction; Top Physics; Higgs Physics; Top Yukawa Coupling; SPANet