Speaker
Description
Sterile neutrinos that couple to the Standard Model via the neutrino magnetic dipole portals have been extensively studied at various experiments. In this work, we scrutinize these interactions for sterile neutrinos in the mass range of 0.1--50 MeV through the nuclear and electron recoils at various neutrino scattering experiments. For the e-flavor specific dipole portal, we demonstrate that Dresden-II can provide leading constraints for m_N \lesssim 0.5 MeV, setting aside currently unresolved theoretical uncertainties. For the mu-flavor case, we show that the COHERENT experiment can probe a unique parameter region for in the mass range of 10--40 MeV with the full dataset collected by the CsI[Na] scintillation detector, including both the energy and timing structure of the neutrino beam. We also present limits on the parameter regions of the tau-flavor dipole portal using measurements of the solar neutrino flux from dark matter direct detection experiments.
