Neutrino mass ordering determination through combined analysis with JUNO and KM3NeT/ORCA

• Published in: Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021)
• Main Authors: Athayde Marcondes de André, João Pedro, Chau, Nhan, Dracos, Marcos, Kalousis, Leonidas, Kouchner, Antoine, Van Elewyck, Veronique
• Other Authors: Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), JUNO, KM3NeT
• Format: Conference Object
• Language: English
• Published: HAL CCSD 2021
• Subjects: neutrino: oscillation; electron; nuclear reactor; KM3NeT; tension; GeV; sensitivity; JUNO; neutrino: atmosphere; matter: effect; interference: effect; antineutrino: spectrum; neutrino: mass; [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]; Orca
• Online Access: https://hal.archives-ouvertes.fr/hal-03373348; https://hal.archives-ouvertes.fr/hal-03373348/document; https://hal.archives-ouvertes.fr/hal-03373348/file/ICRC_JUNO_ORCA.pdf; https://doi.org/10.22323/1.395.1196

International audience The determination of neutrino mass ordering (NMO) is one of the prime goals of several neutrinoexperiments.KM3NeT/ORCA and JUNO are two next-generation neutrino oscillation experiments both aiming ataddressing this question.ORCA determines the NMO by probing Earth matter effects on the oscillation ofatmospheric neutrinos in the GeV energy range.JUNO, on the other hand, is sensitive to the NMO by investigating the interference effects offast oscillations in the reactor electron antineutrino spectrum at medium baseline.This poster presents the potential of determining the NMO through a combined analysis ofJUNO and ORCA data.When measuring the $\Delta m^2_{31}$ with a wrong ordering assumption, the best-fit valuesare different between the two experiments.This tension, together with good constraints on the $\Delta m^2_{31}$ measurement by bothexperiments, enhances the combined NMO sensitivity beyond the simple sum of their sensitivities.The analysis shows that 5$\sigma$ significance is reachable in less than 2 years of data takingwith both experiements for true normal neutrino mass ordering assuming current global best-fitvalues of the oscillation parameters, while 6 years will be needed for any other parameter set.