Studies for the selection of the neutrino events collected in ICARUS T600 at FERMILAB

The ICARUS T600 LAr-TPC detector has restarted in 2020 to collect events at Fermilab exposed to the Booster Neutrino Beam (BNB) within the SBN program, to definitively clarify the open questions of the presently-observed neutrino anomalies related to the possible existence of sterile neutrinos. It is also recording neutrino interactions from the NuMI off-axis beam and these events will be studied to obtain in particular neutrino-Argon cross section measurements. The T600 is taking data at shallow-depth, so a large number of cosmic muons are expected to cross the detector randomly in the 1-ms drift time corresponding to the triggered event. The neutrino interactions should be recognized among the events triggered by cosmics and this condition makes it necessary to deploy suitable automatic tools for the identification, selection, and measurement of the neutrino events. These tools should exploit all the available information from the TPC, from the internal PMTs and from the external Cosmic Ray Tagging system surrounding the detector. In the present thesis tools for the selection of the neutrino interactions recorded in the T600 will be developed starting from the available reconstruction tools and applied to the data recorded and MC events to evaluate the performance. The selected events will be also visually studied to improve the selection efficiency of the neutrino interactions. The focus will be in particular on the selection and reconstruction of the quasi elastic muon neutrino interactions fully contained in the detector.