Background Estimation in Sterile Prompt in the JSNS2 Experiment

The JSNS2 experiment aims to search for the existence of sterile neutrinos at J-PARC. A 1 MW beam of 3 GeV protons incident on a spallation neutron target produces an intense neutrino beam from muon decay at rest. The experiment searches for muon anti-neutrino to electron anti-neutrino oscillations which are detected by the inverse beta decay interaction, followed by gammas from neutron capture on Gd. There was a physics run in 2021, which took 11.9% of approved POT. Using the 2021 data, background study for the prompt candidate sample was performed. Event selection and background estimation of the prompt candidate sample will be introduced in this poster.