Mass hierarchy and CP -phase sensitivity of ORCA using the Fermilab neutrino beam

We explore neutrino mass hierarchy determination and CP-phase measurement using the multimegaton water Cherenkov detector KM3NeT-Oscillation Research with Cosmics in the Abyss in the Mediterranean sea receiving neutrino beam from the Fermilab Long Baseline Neutrino Facility over a 6900 km baseline. We find that with the proposed beam luminosity of 1.2×1021 proton on target per year, it will be possible to determine mass hierarchy at 4σ confidence level within 1 year in the neutrino mode alone. A combined 1 year in neutrino and 1 year in antineutrino mode can determine hierarchy at 6σ confidence level. We also find that a nonzero CP phase can be detected with up to ∼1.8σ significance after 10 years of data taking. We explore degeneracy of neutrino oscillation parameters and uncertainties in detection efficiencies affecting the results.