Measurement of neutrino oscillation parameters with the first six detection units of KM3NeT/ORCA Aiello, S. Díaz García, Antonio Francisco Gutiérrez González, Miguel Navas Concha, Sergio KM3NeT collaboration, / Neutrino Detectors and Telescopes (experiments), Oscillation 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 sin2 θ23 = 0.51+0.04 −0.05, and Δm2 31 = 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. 2024-11-20T11:14:22Z 2024-11-20T11:14:22Z 2024-10-29 journal article Aiello, S. $ Díaz García, A.F. & Guitéerez Gonzáles, M. & Navas Concha, S. & KM3NeT collaboration. et. al. J. High Energ. Phys. 2024, 206 (2024). [https://doi.org/10.1007/JHEP10(2024)206] https://hdl.handle.net/10481/97140 10.1007/JHEP10(2024)206 eng info:eu-repo/grantAgreement/ERC/H2020/101142396 info:eu-repo/grantAgreement/EC/H2020/101008324 http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional Springer Nature