Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 106: Search for new particles 7

T 106.2: Talk

Friday, March 8, 2024, 09:15–09:30, Geb. 20.30: 2.058

Tracking with Acts for Lohengrin - A fixed target dark photon search experiment — •Jan-Eric Heinrichs for the Lohengrin collaboration — Universität Bonn

The true nature of dark matter (DM) has long been of interest for scientists worldwide. Previous searches have so far been unsuccessful in finding proposed DM particles. A promising and not well explored family of DM models contains dark matter particles with masses below ≈1 GeV connected through a portal interaction to the standard model (SM). This portal can be realized via a new vector boson mediating a U(1) gauge interaction, the dark photon. One possible search strategy is looking for the production of dark photons in a process similar to SM bremsstrahlung in a fixed target experiment.

This talk highlights some aspects of Lohengrin, a proposed fixed target experiment at the ELSA accelerator in Bonn. One of the key factors for the discovery potential of the experiment is the precise tracking of low momentum electrons. Electrons mainly loose energy via bremsstrahlung, which is notoriously difficult to correctly parametrize in tracking algorithms due to its non-gaussian nature. I will show first results of using Acts (A Common Tracking Software) to tackle this problem. Acts is a generalized tracking framework currently under development in international collaboration. The key element to enhance electron tracking is a gaussian sum filter. I will show necessary steps to adapt the framework to telescope like detector geometries. First preliminary results for the implementation and performance will be shown.

Keywords: Dark Matter; Dark Photon; ELSA Accelerator; Lohengrin