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T: Fachverband Teilchenphysik

T 61: Higgs I

T 61.2: Talk

Wednesday, March 22, 2023, 16:05–16:20, HSZ/0204

Measurement of the inclusive ttH Cross-Section in the 4ℓ Final State — •Stephen Eggebrecht, Steffen Korn, Arnulf Quadt, Baptiste Ravina, and Elizaveta Shabalina for the ATLAS collaboration — II Physikalisches Institut, Göttingen

The Higgs boson production in association with a top quark pair plays a key role for studying the Yukawa coupling between the Higgs boson and the top quark. The coupling can be determined by measuring the cross-section of the ttH production to various finial states. Multi-lepton final states are quite but pure since most backgrounds are significantly suppressed. The non-resonant ttH→4ℓ process has low rate and is sensitive to various Higgs decay modes like H→ WW, H→ττ, and H→ ZZ. The dominant background arises from ttZ and ZZ events. A multiclass dense neural network (DNN) is trained to separate signal events from these backgrounds and to define analysis regions. Input features such as kinematic information of all final state particles, missing transverse energy, and other high level variables like invariant masses of lepton pairs and their distances are used. An Asimov fit is then performed to evaluate the signal sensitivity.