Constraints on pseudo-Dirac neutrinos using high-energy neutrinos from NGC 1068

TL;DR

This paper uses high-energy neutrino observations from NGC 1068 to set strong constraints on pseudo-Dirac neutrino models, specifically limiting the tiny mass-squared differences that enable active-sterile oscillations over astrophysical distances.

Contribution

It provides one of the strongest experimental limits to date on the tiny mass-squared differences in pseudo-Dirac neutrino scenarios using astrophysical neutrino data.

Findings

Excluded $\delta m^2$ in the range $[1.4 imes 10^{-18}, 10^{-17}]$ eV$^2$ at over 90% confidence

Used IceCube neutrino data from NGC 1068 to test pseudo-Dirac neutrino models

Discussed uncertainties affecting the sensitivity of the constraints

Abstract

Neutrinos can be pseudo-Dirac in Nature - they can be Majorana fermions while behaving effectively as Dirac fermions. Such scenarios predict active-sterile neutrino oscillations driven by a tiny mass-squared difference $(\delta m^2)$, which is an outcome of soft lepton number violation. Oscillations due to tiny $\delta m^2$ can only take place over astrophysical baselines and hence are not accessible in terrestrial neutrino oscillation experiments. This implies that high-energy neutrinos coming from large distances can be naturally used to test this scenario. We use the recent observation of high-energy neutrinos from the active galactic nuclei NGC 1068 by the IceCube collaboration to rule out $\delta m^2$ in the region $[1.4 \times 10^{-18}, 10^{-17}]\, {\rm eV}^2$ at more than $90\%$ confidence level - one of the strongest limits to date on the values of $\delta m^2$. We also discuss possible uncertainties which can reduce the sensitivity of these results.