Karlsruhe 2024 – scientific programme
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T: Fachverband Teilchenphysik
T 50: Top physics 2 (top pair cross section)
T 50.8: Talk
Tuesday, March 5, 2024, 17:45–18:00, Geb. 30.95: Audimax
ttγ production cross section measurements in single-lepton and dilepton final states in proton-proton collisions at √s = 13 TeV with the ATLAS detector — Diptaparna Biswas1, Beatrice Cervato1, Markus Cristinziani1, Carmen Diez Pardos1, Ivor Fleck1, Arpan Ghosal1, Gabriel Gomes1, Jan Joachim Hahn1, Vadim Kostyukhin1, Nils Krengel1, Buddhadeb Mondal1, •Stefanie Müller1, Katharina Voss1, Wolfgang Walkowiak1, Adam Warnerbring1, and Tongbin Zhao1,2 — 1Experimentelle Teilchenphysik, Center for Particle Physics Siegen, Universität Siegen — 2Shandong University, China
Top quark pair production (tt) in association with an additional photon (ttγ) is the leading process for measuring the coupling strength of the top quark-photon interaction. Precise measurements of the ttγ process are relevant to test the Standard Model and probing for new physics effects at very high energy scale.
In this contribution ttγ cross section measurements will be presented using a luminosity of 140 fb−1 of data collected by the ATLAS detector in pp collisions at √s = 13 TeV. The studies are performed focussing on ttγ processes where the γ is radiated from initial state production. The toolkit RIVET (Robust Independent Validation of Experiment and Theory) is employed to perform studies with Monte Carlo simulations in the single-lepton and dilepton tt decay channels.