Speaker
Description
The JSNS2 (J-PARC Sterile Neutrino Search at the J-PARC Spallation
Neutron Source) experiment searches for neutrino oscillations over a
baseline of 24 m, targeting Δm² values around 1 eV². Its primary goal is
to provide a direct test of the LSND anomaly.
The experiment has carried out physics runs from 2021 to 2026,
accumulating a total exposure of 6 × 10²² protons on target (POT) at J-
PARC.
The first results from the search for a ν̄ₑ excess, based on the 2022
physics run data set (0.8 × 10²² POT), were recently published. Since
then, the analysis has been extended to include the 2024 physics run
data set, corresponding to a total exposure of 2.0 × 10²² POT. In this
talk, the latest results will be presented.
The results will be compared with expectations from sterile-neutrino
oscillations as well as with a model-independent prediction obtained by
directly scaling the LSND anomaly.