Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 46: Top Physics II

T 46.4: Vortrag

Mittwoch, 18. März 2026, 17:00–17:15, KH 00.011

Measurement of differential cross-sections of single-top-quark production in association with a photon at the ATLAS experiment with √s = 13 TeV — •Lucas Cremer¹, Nils Julius Abicht¹, Andrea Helen Knue¹, Tomas Dado², and Marina Andreß³ — ¹TU Dortmund — ²CERN — ³Bergische Universität Wuppertal

The inclusive measurement of single-top-quark production in association with a photon at the ATLAS experiment yielded an increased cross-section compared to the Standard Model prediction. As the analysis was not statistically limited, a measurement of differential cross-sections is performed to further investigate the excess.

A signal region enriched with tqγ events is defined using machine learning techniques to separate signal and background events. Corresponding distributions sensitive to physics beyond the Standard Model are unfolded to particle level utilising a profile likelihood unfolding approach. An approach for the optimisation of the binning as well as the stability of the unfolding is investigated. The results estimated on the complete ATLAS Run-2 dataset, corresponding to an integrated luminosity of 140 fb⁻¹, are presented.

Keywords: Single Top; Unfolding; Photon