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T: Fachverband Teilchenphysik

T 84: Search for Dark Matter IV

T 84.2: Vortrag

Donnerstag, 3. April 2025, 16:30–16:45, VG 4.102

Light Dark Matter Search with DarkMESA — •Christian Stoß for the MAGIX collaboration — Institute for Nuclear Physics, Johannes Gutenberg-University Mainz, Germany

The existence of Dark Matter remains one of the most significant open questions in particle physics. The DarkMESA experiment aims to search for Light Dark Matter (LDM) in an unexplored mass and coupling regime. This parasitic beam dump experiment will be located downstream of the P2 experiment at the new MESA accelerator in Mainz. It is planned to operate for 10,000 hours in extracted beam mode, using a 150 µ A electron beam with an energy of 150 MeV.

In the simplest model of LDM, the dark matter particle χ couples to a massive vector particle, the dark photon γ′. In this framework, electrons in the beam dump can produce γ′ via a Bremsstrahlung-like process. If kinematically allowed, these dark photons then decay into χχ pairs. If LDM exists within the targeted parameter space, a fraction of the produced LDM will scatter off electrons or nuclei in the calorimeter’s Cherenkov crystals, generating measurable signals.

This contribution will include a brief overview of the planned experimental stages of DarkMESA as well as a further study for possible improvement of the readout techniques with additional SiPMs at different operating temperatures.