Speaker
Description
Coherent Elastic Neutrino-Nucleus Scattering (CEνNS) is a powerful tool for probing both Standard Model (SM) and beyond-SM (BSM) physics. The remarkable CEνNS observations from the CONUS+ collaboration at nuclear reactors using a germanium target explore the fully coherent regime at unprecedentedly low energies, where nuclear structure uncertainties play a marginal role.
This talk presents the first comprehensive joint analysis of germanium-based CEνNS data at reactors, incorporating results from CONUS+, TEXONO, and νGeN alongside COHERENT CsI and Ar measurements, to gain new insights into the weak mixing angle, neutrino electromagnetic properties and new mediators. The role of elastic neutrino-electron scattering at reactors is also explored, providing the strongest direct limits to date on the millicharge of electron neutrinos.
Additionally, I will highlight the complementarity between reactor-based measurements and the COHERENT germanium observation, which exhibits a ∼2σ deviation from SM expectation, motivating further studies to refine theoretical interpretations and to improve experimental precision.
