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T: Fachverband Teilchenphysik

T 58: Other Exp., tt

T 58.4: Talk

Wednesday, March 22, 2023, 16:35–16:50, HSZ/0103

top-Yukawa coupling extraction from tt cross-section using ATLAS data — •Supriya Sinha for the ATLAS collaboration — DESY Zeuthen

The aim of this analysis is to extract the top-Yukawa coupling (Y_t) from the tt cross-section close to the threshold. The presence of a virtual Higgs boson in the loop for the tt production process affects several kinematic distributions. This boson exchange mainly modifies the differential distributions near the tt production threshold energy. It becomes highly sensitive to Y_t, and hence, is used to extract its value.

This talk introduces the involved physics processes and gives an insight to the analysis strategy. It also highlights a method to reconstruct the tt mass efficiently with a minimal bias. The decay channel considered for this analysis is the lepton+jets final state. Full Run-II data with an integrated luminosity of 139 fb⁻¹ taken by the ATLAS experiment at 13 TeV, is used.