New results from the SuperCDMS-HVeV program

SuperCDMS SNOLAB is a direct detection dark matter (DM) experiment currently under construction two kilometers underground at the SNOLAB laboratory near Sudbury, Canada. Its goal is to achieve world-leading sensitivity to DM-nucleus scattering within a mass range of 0.5 to 5 GeV. In parallel, gram-scale prototype detectors, known as HVeV devices, have been developed. These detectors achieve energy resolutions at the eV scale, enabling the detection of single electron-hole pairs when operated under high-voltage bias. HVeV devices present a unique opportunity to probe low-mass dark matter, study charge propagation, and refine calibration techniques that will also be implemented in SuperCDMS SNOLAB operations.

In this talk the latest results from the fourth data taking campaign with HVeV detectors in the NEXUS underground facility at Fermilab will be presented. A recent search for electron recoil DM candidates will be highlighted, which takes advantage of a new detector holder designed to eliminate luminescence-induced background from printed circuit boards. Additionally, a novel calibration method using Compton step spectral features in the low-energy region will be discussed. ... mehrFinally, updates from the latest HVeV data-taking campaign at the SNOLAB laboratory will be introduced.