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

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Rink,  Thomas
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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2211.16520.pdf
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Citation

Rink, T., & Sen, M. (2022). Constraints on pseudo-Dirac neutrinos using high-energy neutrinos from NGC 1068. arXiv, 2211.16520.


Cite as: https://hdl.handle.net/21.11116/0000-000C-1F05-D
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 oscillation 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 take place only over astrophysical baselines and hence are not
accessible in terrestrial neutrino oscillation experiments. This implies that
high-energy neutrinos coming from large distances can naturally be 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 constrain
$\delta m^2 \leq 10^{-18}{\rm eV}^2$ at more than $90\%$ confidence level - one
of the strongest limits to date on the values of $\delta m^2$.