Neutrino mass ordering determination through combined analysis with JUNO and KM3NeT/ORCA
Résumé
The determination of neutrino mass ordering (NMO) is one of the prime goals of several neutrino
experiments.
KM3NeT/ORCA and JUNO are two next-generation neutrino oscillation experiments both aiming at
addressing this question.
ORCA determines the NMO by probing Earth matter effects on the oscillation of
atmospheric neutrinos in the GeV energy range.
JUNO, on the other hand, is sensitive to the NMO by investigating the interference effects of
fast oscillations in the reactor electron antineutrino spectrum at medium baseline.
This poster presents the potential of determining the NMO through a combined analysis of
JUNO and ORCA data.
When measuring the $\Delta m^2_{31}$ with a wrong ordering assumption, the best-fit values
are different between the two experiments.
This tension, together with good constraints on the $\Delta m^2_{31}$ measurement by both
experiments, 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 taking
with both experiements for true normal neutrino mass ordering assuming current global best-fit
values of the oscillation parameters, while 6 years will be needed for any other parameter set.
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