Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 28: Top quark production II

T 28.9: Talk

Tuesday, March 16, 2021, 18:00–18:15, Tc

Measurement of tt+γ production with full Run 2 data — •Andreas Kirchhoff, Arnulf Quadt, Elizaveta Shabalina, and Knut Zoch — II. Physikalisches Institut, Georg-August-Universität Göttingen

The optimal way to measure the top-photon coupling and later interpret it within an EFT-framework 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, most of such photons will come from the decay products of the top quarks and hence have nothing to do with the top-photon coupling. In contrast, photons produced in the production of the tt pair mostly originate from the top quark (beside a small contribution from ISR). The separation of photons originating from production and decay is tried for the first time in this ATLAS analysis. In this talk, the status of the currently ongoing full Run 2 analysis of the tt+γ process will be presented with some first studies that use deep neural networks to enhance the sensitivity to the top-photon coupling.