Pulse Shape Discrimination in JSNS${}^2$

Abstract

JSNS${}^2$ (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source) is an experiment that is searching for sterile neutrinos via the observation of $\bar{\hat{I}}{½}_{\hat{I}}¼\to \bar{\hat{I}}{½}_e$ appearance oscillations using neutrinos with muon decay-at-rest. For this search, rejecting cosmic-ray-induced neutron events by Pulse Shape Discrimination (PSD) is essential because the JSNS${}^2$ detector is located above ground, on the third floor of the building. We have achieved 95$\%$ rejection of neutron events while keeping 90$\%$ of signal, electron-like events using a data driven likelihood method.

arXiv admin note: text overlap with arXiv:2111.07482, arXiv:2308.02722