%0 Conference Proceedings %T Neutrino mass ordering determination through combined analysis with JUNO and KM3NeT/ORCA %+ Institut Pluridisciplinaire Hubert Curien (IPHC) %+ AstroParticule et Cosmologie (APC (UMR_7164)) %+ Institut Universitaire de France (IUF) %A Athayde Marcondes de André, João Pedro %A Chau, Nhan %A Dracos, Marcos %A Kalousis, Leonidas %A Kouchner, Antoine %A van Elewyck, Veronique %< sans comité de lecture %( PoS %B 37th International Cosmic Ray Conference %C Berlin, Germany %V ICRC2021 %P 1196 %8 2021-07-15 %D 2021 %R 10.22323/1.395.1196 %K neutrino: mass %K antineutrino: spectrum %K interference: effect %K matter: effect %K neutrino: atmosphere %K neutrino: oscillation %K JUNO %K sensitivity %K KM3NeT %K tension %K GeV %K nuclear reactor %K electron %Z Physics [physics]/Astrophysics [astro-ph]Conference papers %X 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. %G English %Z JUNO %Z KM3NeT %2 https://hal.science/hal-03373348/document %2 https://hal.science/hal-03373348/file/ICRC_JUNO_ORCA.pdf %L hal-03373348 %U https://hal.science/hal-03373348 %~ IN2P3 %~ OBSPM %~ CEA %~ DRS-IPHC %~ APC %~ CNRS %~ UNIV-STRASBG %~ IPHC %~ PSL %~ SITE-ALSACE %~ UNIV-PARIS %~ UNIVERSITE-PARIS %~ UP-SCIENCES %~ OBSPM-PSL