The first search for bosonic super-WIMPs with masses up to 1 MeV/c$^2$ with GERDA

Understand

We present the first search for bosonic super-WIMPs as keV-scale dark matter candidates performed with the GERDA experiment.

• GERDA is a neutrinoless double-beta decay experiment which operates high-purity germanium detectors enriched in $^{76}$Ge in an ultra-low background environment at the Laboratori Nazionali del Gran Sasso (LNGS) of INFN in Italy.
• Searches were performed for pseudoscalar and vector particles in the mass region from 60 keV/c$^2$ to 1 MeV/c$^2$.
• No evidence for a dark matter signal was observed, and the most stringent constraints on the couplings of super-WIMPs with masses above 120 keV/c$^2$ have been set.