SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 130: Top II

T 130.3: Vortrag

Donnerstag, 23. März 2023, 18:00–18:15, HSZ/0401

Measurements of differential cross-sections of the ttγ production in the semileptonic and dileptonic channels in pp collisions at √s = 13 TeV with the ATLAS detector — •Buddhadeb Mondal¹, Binish Batool¹, Beatrice Cervato¹, Markus Cristinziani¹, Carmen Diez Pardos¹, Ivor Fleck¹, Arpan Ghosal¹, Gabriel Gomes¹, Jan Joachim Hahn¹, Vadim Kostyukhin¹, Amartya Rej¹, Katharina Voss¹, Wolfgang Walkowiak¹, and Tongbin Zhao^1,2 — ¹Center for Particle Physics Siegen, Experimentelle Teilchenphysik, Universität Siegen — ²Shandong University, China

The top quark being the heaviest fundamental particle in the Standard Model (SM) plays a very important role in the study of fundamental interactions. It has a very short lifetime and it decays before it hadronizes, passing its properties to its decay products. Top quark pair production in association with a photon (ttγ) is a very important process for measuring the coupling between top quark and photon. A precise measurement of this coupling is necessary for testing the SM and is also a probe for new physics effects at very high energy scale. In this talk, measurements of ttγ differential cross-sections using 139 fb⁻¹ of data collected by the ATLAS detector in proton-proton collisions at √s = 13 TeV will be presented. They are performed in the semileptonic and dileptonic tt decay channels.