Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 6: Top Quarks: Production (Exp.) 1

T 6.7: Vortrag

Montag, 21. März 2022, 17:45–18:00, T-H19

Search for single production of top quarks in association with a photon with the ATLAS detector at √s = 13 TeV — •Björn Wendland, Johannes Erdmann, and Kevin Kröninger — Technische Universität Dortmund, Fakultät Physik

Analyses of top quark production in association with a photon are important tests of the Standard Model. They probe top quark properties with respect to the electroweak interaction, such as the top quark charge or the structure of the top quark and photon vertex. Top quark pair production with a photon in leptonic final states was observed and investigated extensively by the ATLAS and CMS collaborations. No significant deviations from the Standard Model expectations were found by now.

With the rich datasets collected by the ATLAS and CMS experiments during Run 2 of the LHC programme, it is feasible to observe single production of top quarks in association with a photon. The CMS collaboration reported evidence corresponding to 4.4 σ for this process using a partial Run 2 dataset.

In this talk, studies of t-channel single production of top quarks with a photon using the full Run 2 dataset collected by the ATLAS detector are presented. As the leptonic decay channel of the top quark is used in this analysis, the final state consists of either an electron or a muon, a jet containing B hadrons, missing transverse energy, a photon and an additional jet produced in the forward direction.