Speaker
Description
Hyper-Kamiokande is a next-generation neutrino experiment that is under construction in Japan. The Hyper-Kamiokande far detector will be instrumented by thousands of photomultipliers (PMT) which detect the Cherenkov light emitted by charged particles produced by neutrino interactions in the water. The neutrino flavor can be specified by identifying the type of charged particles produced in neutrino interactions. In addition to the electron neutrinos and muon neutrinos produced in the atmosphere, the Hyper-Kamiokande also observes tau neutrinos which are mainly produced by oscillations of muon neutrinos. Measurement of tau neutrino appearance provability is an important subject of Hyper-Kamiokande. Tau particles decay into charged leptons or hadrons with a short lifetime. When tau decay into hadrons, many Cherenkov rings are produced. We attempt to distinguish such events from electron and muon neutrino interactions, especially deep inelastic scatterings with multiple rings, using machine learning based on the PMT signals. The performance of the selection is presented in the poster.
