Speaker
Description
In this work, we apply recent direct detection constraints on electron recoils to freeze-in Dark Matter (DM) models. Due to recent results obtained by direct detection experiments, especially DAMIC-M, the dark photon scenario is severely constrained. However, there are different scenarios in which these bounds can be avoided. In freeze-in models, the scaling of the DM relic abundance allows the dark photon to be a subdominant component. DAMIC-M results rules out up to 50 %, with future experiments aiming to constraint up to 0.001 %. Next, we show that in scenarios where the main DM production channels are not electron-positron or plasmon decay, such as Lμ − Lτ , the main contributions comes from ν, that are now charged to the Z′. Thus, such models avoid the current direct detection constraints on electron recoils.
As a result, we provide new targets for upcoming direct detection experiments looking for electron recoils such as DAMIC, SuperCDMS or Oscura.
