Joint-Search for Light Sterile Neutrino Oscillations by PROSPECT, STEREO, and Daya Bay

The PROSPECT, STEREO, and Daya Bay experiments have provided world-leading results regarding the detection of reactor-produced antineutrinos. PROSPECT and STEREO have made short-baseline (~10m) measurements of antineutrinos from highly enriched uranium (HEU) research reactors where over 99% of the antineutrino flux comes from ²³⁵U. The Daya Bay experiment has studied antineutrino emission at low-enriched uranium (LEU) power reactors that use a mixture of fissile isotopes, with detectors spanning a much larger baseline from the reactor cores (~2km). All three experiments have performed independent searches for sterile neutrino oscillations, excluding different regions of oscillation phase space. A new collaborative effort, utilizing the final data sets from all three experiments, aims to improve the precision of the search for light sterile neutrinos beyond what would be achievable by each experiment individually. In particular, the combination of information from two HEU-based and one LEU-based experiment could extend the phase space coverage in large ∆m² > 10 eV² regions. This presentation reports the current status of the joint oscillation analysis between these experiments.