Speaker
Description
The JSNS2 (J-PARC Sterile Neutrino Search at the J-PARC Spallation Neutron Source) experiment aims to search for sterile neutrinos with ∆m2 near 1eV2. A 3 GeV J-PARC proton beam incident on a mercury target produces an intense neutrino beam from muon decay at rest. The JSNS2 detects anti-electron neutrinos from oscillations of anti-muon neutrinos via the inverse beta decay reaction. The JSNS2 detector has a fiducial volume of 17 tons filled with GdLS to detect anti-electron neutrinos efficiently and is located at 24 m baseline from the target. It is expected to provide the ultimate test of the LSND anomaly by replicating nearly identical conditions with a much better signal-to-background ratio. JSNS2 starts the physics run in 2021. Sterile neutrino candidates are selected by pairing the prompt and delayed signals of inverse beta decay. In this talk, a background study will be described with the conditions to Inverse Beta Decay signal for sterile neutrino search in upper energy region using the first physics run. It verifies the dominant background in the side-band and It makes possible to understand the background before opening the signal region.
