SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 130: Top II

T 130.5: Vortrag

Donnerstag, 23. März 2023, 18:30–18:45, HSZ/0401

Search for ttγγ production in pp collisions at √s=13 TeV with the ATLAS detector — •Arpan Ghosal¹, Binish Batool¹, Beatrice Cervato¹, Markus Cristinziani¹, Carmen Diez Pardos¹, Ivor Fleck¹, Gabriel Gomes¹, Jan Joachim Hahn¹, Vadim Kostyukhin¹, Buddhadeb Mondal¹, 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 pair production in association with one or more photons are important Standard Model processes that allow us to measure the strength of the electroweak coupling of the top quark with photon. While the production of ttγ is well-studied, the ttγγ process has not been observed yet. The rare ttγγ process is not only a good candidate for probing the top electroweak coupling but is also significant as an irreducible background process to the tt production with a Higgs boson decaying to two photons (H→γγ). New sources of CP-violation can appear as electric dipole moment terms in top-quark interactions, and their precise measurement is essential to determine the effects of new physics. Understanding the ttγγ process can help set better bounds on these anomalous moments. The presentation will discuss the ongoing efforts in the search for the ttγγ process in the semileptonic tt decay channel with a cut-and-count approach using the full Run 2 dataset collected by the ATLAS detector at √s = 13 TeV.