We propose an extended Left-Right symmetric model with an additional global symmetry U(1)X, which after spontaneous symmetry breaking collapses to a residual subgroup Z2, ensuring that the light active neutrino masses are generated via a double seesaw mechanism at two loop level, with the Dirac submatrix arising at one loop. It also guarantees one loop level masses for the SM charged fermions...
Sterile neutrinos are present in multiple extensions to the Standard Model and participate in neutrino mass mechanisms, from simple type-I seesaw models to UV complete theories like left-right symmetry. In total analogy to the case of light neutrinos, the neutrinoless double β decay amplitude induced by the exchange of sterile neutrinos requires the introduction of a leading-order, short-range...
CONNIE (COherent Neutrino-Nucleus Interaction Experiment) utilizes high-resistivity silicon CCDs to measure coherent elastic neutrino-nucleus scattering (CEvNS) of reactor antineutrinos on silicon nuclei at the Angra-2 reactor in Brazil. In 2021, the setup was enhanced with two Skipper CCDs, pushing the sensitivity threshold to 15 eV and demonstrating the potential of Skipper CCDs in reactor...
