Combined sensitivity to the neutrino mass ordering with JUNO, the IceCube Upgrade, and PINGU

Understand

The ordering of the neutrino mass eigenstates is one of the fundamental open questions in neutrino physics.

• While current-generation neutrino oscillation experiments are able to produce moderate indications on this ordering, upcoming experiments of the next generation aim to provide conclusive evidence.
• In this paper we study the combined performance of the two future multi-purpose neutrino oscillation experiments JUNO and the IceCube Upgrade, which employ two very distinct and complementary routes towards the neutrino mass ordering.
• The approach pursued by the $20\,\mathrm{kt}$ medium-baseline reactor neutrino experiment JUNO consists of a careful investigation of the energy spectrum of oscillated $\bar{\nu}_e$ produced by ten nuclear reactor cores.