Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 50: Top physics 2 (top pair cross section)

T 50.4: Talk

Tuesday, March 5, 2024, 16:45–17:00, Geb. 30.95: Audimax

Extracting the Top Yukawa coupling from the tt differential cross section using ATLAS data — •Sadia Marium — DESY, Zeuthen, Germany

The aim of this analysis is to extract the top-Yukawa coupling (Y_t) from the tt cross-section. There are loop corrections due to Higgs exchange between the tt pair. This virtual Higgs exchange affects the distribution of the mass of the tt system M_tt and the top quark production angle cosθ_t^* in the tt rest frame. These kinematic variables are therefore sensitive to Y_t, and hence, their distributions are used to extract its value. The main focus of this talk is to analyse these kinematic variables. The dileptonic and lepton+jets final states are analysed. In the dileptonic channel, due to missing neutrinos, the full tt system cannot be reconstructed, therefore, possible proxy observables are studied. The aim is to use the full Run-II data with an integrated luminosity of 140 fb⁻¹ taken by the ATLAS experiment at 13 TeV collision energy.

Keywords: top; Yukawa coupling; ATLAS