2024/08/13 by S. Aiello, KM3NeT Collaboration, Aiello, S. +352 · 7 citations
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Atmospheric Ozone and Climate #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Neutrino Physics Research
paper · pdf · doi:10.48550/arxiv.2408.07015
openalex publication_date 2024/08/13 · openalex created_date 2024/08/30 · openalex updated_date 2026/07/30
KM3NeT/ORCA is a water Cherenkov neutrino detector under construction and anchored at the bottom of the Mediterranean Sea. The detector is designed to study oscillations of atmospheric neutrinos and determine the neutrino mass ordering. This paper focuses on an initial configuration of ORCA, referred to as ORCA6, which comprises six out of the foreseen 115 detection units of photo-sensors. A high-purity neutrino sample was extracted, corresponding to an exposure of 433 kton-years. The sample of 5828 neutrino candidates is analysed following a binned log-likelihood method in the reconstructed energy and cosine of the zenith angle. The atmospheric oscillation parameters are measured to be sin2θ23= 0.51+0.04-0.05, and Δm231 = 2.18+0.25-0.35× 10-3~eV2 ∪ \-2.25,-1.76\× 10-3~eV2 at 68% CL. The inverted neutrino mass ordering hypothesis is disfavoured with a p-value of 0.25.