SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 130: Top II

T 130.4: Vortrag

Donnerstag, 23. März 2023, 18:15–18:30, HSZ/0401

Measurement of tt+γ production with the full Run 2 ATLAS dataset — •Andreas Kirchhoff, Arnulf Quadt, Baptiste Ravina, and Elizaveta Shabalina — II. Physikalisches Institut, Georg-August-Universität Göttingen

The optimal way to measure the top-photon coupling would be an e⁺e⁻ collider with sufficient energy. As such a collider does not exist, another possibility to measure it is the production of tt pairs in association with a photon. Unfortunately, such photons will mostly originate from the decay products of the top quarks and hence do not convey any information about the top-photon coupling. However, photons radiated from the top quarks themselves (and to some extent, from the initial state quarks) can be differentiated based on their kinematics and the topology of the event. The separation between ’production’ and ’decay’ modes is achieved for the first time in this ATLAS analysis, thanks to a dedicated MVA approach. In this talk, the measurement of the inclusive fiducial cross section of the ttγ process with photons originating from production and decay in single- and dilepton channels will be presented.