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T: Fachverband Teilchenphysik
T 130: Top II
T 130.5: Talk
Thursday, March 23, 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 Zhao1,2 — 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.