Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 50: Top physics 2 (top pair cross section)

T 50.8: Vortrag

Dienstag, 5. März 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 Zhao^1,2 — 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.

Keywords: Top Quark; ATLAS; Rivet; Monte Carlo; photon