New constraints on MeV to GeV mass dark matter candidates with DarkSide-50 experiment

by Stefano Piacentini (Sapienza Università di Roma)

Monday 17 Oct 2022, 16:00 → 17:30 Europe/Rome

Aula Conversi (Dip. di Fisica - Edificio G. Marconi)

The DarkSide-50 experiment is based on a dual phase Time Projection Chamber with a low-radioactivity argon target to search for dark matter interactions. We report on the search for MeV to GeV dark matter candidates with the entire (12 306 ± 184) kg * day dataset acquired at LNGS between December 2015 and February 2018. The recent analysis, with a more accurate calibration of the detector response, improved background model, and better determination of systematic uncertainties, extends the exclusion region for spin-independent dark matter interactions below the current experimental constraints in the [1.2, 3.6] GeV/c^2 WIMP mass range. In addition, the inclusion of so-called Migdal effect extends this mass range down to a mass of 40 MeV/c^2. Finally, we exclude new parameter space for the dark matter-electron cross section, the axioelectric coupling constant, and the dark photon kinetic mixing parameter, and we produce the first dark matter direct-detection constraints on the mixing angle |Ue4|^2 for keV sterile neutrinos.

Link zoom: https://uniroma1.zoom.us/j/87038625161?pwd=cEtGRjZNT2VWSlJIWmxaYmxSMDhRZz09