Short-Baseline neutrino oscillation searches with the ICARUS detector at Fermilab

Abstract

The Short Baseline Neutrino program at Fermilab will address one of the most urgent question in the neutrino physics scenario, namely the possible existence of a sterile neutrino at 1 eV mass scale, by searching both $\nu_e$ appearance and $\nu_\mu$ disappearance with the Booster Neutrino Beam. The Short Baseline Neutrino Far Detector, ICARUS T600, successfully operated at Laboratori Nazionali del Gran Sasso from 2010 to 2013 studying neutrino oscillations with the CERN Neutrinos to Gran Sasso beam. ICARUS performed a sensitive search for Liquid Scintillator Neutrino Detector-like anomalous $\nu_e$ appearance in the CERN Neutrinos to Gran Sasso beam, constraining the allowed parameters to a narrow region around 1 eV$^2$. After a significant overhaul at CERN, ICARUS was installed at Fermilab. The detector has started operations in summer 2020 and its commissioning was completed in May 2022, collecting the first neutrino events from the Booster Neutrino Beam and the Neutrinos at the Main Injector off-axis beam. In this paper ICARUS achievements are addressed as well as its status and plans for the new run at Fermilab and the ongoing developments of the analysis tools needed to fulfill its physics program.