Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 88: Top Physics IV

T 88.6: Talk

Friday, March 20, 2026, 10:15–10:30, KH 00.011

Enhancing Top-Quark Reconstruction Across Topologies in ATLAS — •Constantin Eckardt — DESY, Zeuthen, Germany

Searches for beyond-the-standard-model physics at particle detectors such as ATLAS often involve top-quark associated events. Top-quark reconstruction in most searches is typically optimized for a specific decay topology. By incorporating multiple reconstruction algorithms, each tailored to different top-decay configurations, one can further expand the reconstruction reach and improve overall efficiency. This work presents studies of a range of top-quark reconstruction algorithms developed for different decay topologies and applied to a variety of physics cases. These studies are used to guide the further optimization of a recently launched umbrella tool within ATLAS -- THAT (Top Hacker Across Topologies) -- which recommends the most effective reconstruction algorithm on a per-event basis. Such a tool has the potential to enhance many different analyses that rely on accurate and efficient top-quark reconstruction.

Keywords: ATLAS; top reconstruction; machine learning