Speaker
Description
In the last years, the long predicted Standard Model reaction channel of coherent elastic neutrino-nucleus scattering (CEvNS) has been confirmed by measurements of (anti-)neutrinos emitted from pion decay at rest sources and nuclear reactors, also with multiple target materials. As we slowly transition with the next generation of experiments from first observations to precision measurements, CEvNS opens up a plethora of possibilities for investigations within the Standard Model and beyond. This talk will focus on testing lepton non-unitarity with the next generation of reactor experiments. Depending on the new physics origin of non-unitarity, the associated phenomenology can vary significantly. By examining both high scale (seesaw limit) and low scale (light sterile limit) scenarios, we show how coherent elastic neutrino-nucleus and elastic electron-neutrino scattering are altered by new physics. We present sensitivities to corresponding parameters by exploiting the potential of future germanium-based reactor experiments. In doing so, we underline the importance of CEvNS experiments for new physics searches, highlighting their role in advancing our understanding of fundamental interactions.
