Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 5: Methods in Particle Physics I

T 5.7: Talk

Monday, March 16, 2026, 17:45–18:00, KH 00.020

Towards an implementation of ACTS for the Belle II experiment — •Marc-Philipp Thomas, Giacomo De Pietro, and Torben Ferber — Institute of Experimental Particle Physics, Karlsruhe Institute of Technology, Karlsruhe, Germany

Track reconstruction is a fundamental component of particle physics experiments, relying critically on robust and precise track fitting algorithms that must perform reliably across a wide range of particle momenta. The Belle II experiment at the asymmetric electron-positron SuperKEKB collider presents particular challenges for track fitting. These include particles with momenta ranging from a few tens of MeV to several GeV, and an asymmetric detector geometry.

In this talk, we discuss the integration of the experiment-independent ACTS (A Common Tracking Software) toolkit into the Belle II reconstruction chain. In the proposed workflow, track finding is performed within the Belle II Analysis Software Framework, while ACTS is used solely for track fitting. We will present the current status of this integration effort, including the first results on ACTS track fitting for the Silicon Vertex Detector, and a comparison with the current Belle II track-fitting approach in terms of reconstruction efficiency, parameter resolution, and robustness for low-momentum tracks.

Keywords: Belle II; ACTS; Tracking