Speaker
Description
This poster reports the current status of the sterile neutrino search in the Super-Kamiokande experiment using atmospheric neutrinos.
A comprehensive sterile neutrino search framework has been developed based on nuSQuIDS, extending the existing Super-Kamiokande oscillation analysis to incorporate sterile neutrino scenarios. This framework enables a simultaneous scan over the full set of relevant oscillation parameters, including sin²θ₁₄, sin²θ₂₄, sin²θ₃₄, and Δm²₄₁.
Neutral-current enhanced event samples are incorporated using a ProtonFit-based selection, focusing on single-ring events with reconstructed proton rings. By exploiting neutral-current interactions together with the directional information of incident neutrinos, this analysis gains enhanced sensitivity to sterile neutrino mixing, which primarily manifests as a deficit in neutral-current interactions.
This poster presents the analysis strategy, validation of the framework, and the current status of the sterile neutrino search in Super-Kamiokande.