Supernova $ν$ flavour conversions in DUNE: the slow, the fast and the standard

Abstract

The flavour composition of a future supernova neutrino signal is expected to carry measurable imprints of flavour conversion processes in the dense stellar medium. In this work, we analyse the sensitivity of the upcoming Deep Underground Neutrino Experiment (DUNE) to three phenomenologically distinct effects: slow energy-dependent collective oscillations, fast energy-independent collective oscillations, and standard MSW conversions. By integrating GLoBES and MultiNest and using benchmark neutrino fluxes at emission, we assess the potential of DUNE to extract the underlying flux parameters and discriminate among conversion scenarios.

Figures (4)

• Figure 1: Spectral fluences and cross sections for the different (anti)neutrino flavours, as functions of their true energies (left), and expected event rates in DUNE for each detection channel, as functions of reconstructed energy (right), for benchmark A and in the absence of flavour conversions.
• Figure 2: Spectral fluences for the different (anti)neutrino flavours, as functions of their true energies, for benchmark A and the different, indicated flavour conversion scenarios. Grey shading corresponds to the reference unoscillated case.
• Figure 3: Credible regions (1$\sigma$) for neutrino spectral parameters inferred for benchmark A, in the $\langle E\rangle_i-\alpha_i$, $\langle E\rangle_i-\epsilon_i$, and $\alpha_i-\epsilon_i$ planes. Each row corresponds to a different flavour-conversion scenario. Markers indicate the 2D posterior modes. Solid contours and filled markers correspond to NO, while dashed contours and open markers pertain to IO. Colours identify the neutrino species $i$, with $\nu_e$ in blue, $\bar{\nu}_e$ in green, and $\nu_x$ in grey.
• Figure 4: The same as \ref{['fig:A1s']}, for benchmark B.