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

Thomas Rink, Manibrata Sen.

29 Nov 2022.

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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.