SMuK 2023 – scientific programme
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T: Fachverband Teilchenphysik
T 130: Top II
T 130.3: Talk
Thursday, March 23, 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 Zhao1,2 — 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.