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T: Fachverband Teilchenphysik

T 23: Top Physics I

T 23.2: Vortrag

Dienstag, 17. März 2026, 16:30–16:45, KH 00.011

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

Top quark, being the heaviest Standard Model fermion, has the highest value of Yukawa coupling with the Higgs field. This contribution presents an extraction of the top-quark Yukawa coupling, (Y_t), from the tt differential cross-section in the dilepton final state. Near the tt production threshold, electroweak virtual corrections, including Higgs-boson exchange, modify the kinematic distributions of the invariant 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. In the dilepton channel, the presence of two neutrinos prevents full event reconstruction, motivating the use of proxy observables that retain sensitivity to these effects. The analysis uses proton*proton collision data at √s=13 TeV corresponding to an integrated luminosity of 140 fb⁻¹, collected with the ATLAS detector at the Large Hadron Collider.

Keywords: Yukawa; Top-quark; ttbar Dilepton channel; top-Higgs coupling; ATLAS