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T: Fachverband Teilchenphysik

T 23: Top physics 1

T 23.7: Vortrag

Montag, 4. März 2024, 17:30–17:45, Geb. 30.95: Audimax

EFT interpretation of a ttγ differential cross-section measurement using full Run 2 data with the ATLAS experiment — 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

The production of top quark pairs in association with a photon (ttγ) is an important process to investigate the coupling between the photon and the top quark. Precise measurements of this coupling allow testing the Standard Model (SM) and probe for new physics effects. The Standard Model Effective Field Theory (SMEFT) models physics phenomena beyond the SM via the introduction of higher dimension operators. In this talk, the measurement of the differential ttγ cross-section using 140 fb⁻¹ of data collected by the ATLAS detector in proton-proton collisions at √s=13 TeV and its interpretation in the context of SMEFT will be presented. The measurement is performed at particle level in the single lepton and dilepton decay channels of the top quarks. The differential cross-section as a function of photon transverse momentum is used to set constraints on the electroweak dipole moments of the top quark.

Keywords: Top Quark; Photon; Effective Field Theory