Constraining pseudo-Dirac neutrinos from a galactic core-collapse supernova

Sen, Manibrata

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Constraining pseudo-Dirac neutrinos from a galactic core-collapse supernova

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Sen, Manibrata
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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2205.13291.pdf
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Citation

Sen, M. (2022). Constraining pseudo-Dirac neutrinos from a galactic core-collapse supernova. arXiv, 2205.13291.

Cite as: https://hdl.handle.net/21.11116/0000-000C-1FE8-D

Abstract

Neutrinos can be pseudo-Dirac in nature -- Majorana fermions behaving as
Dirac fermions for all practical purposes. In such a scenario, active and
sterile neutrinos are quasi-degenerate in mass, and hence oscillations between
the two, due to their tiny mass-squared difference $(\delta m^2)$, can develop
only over very long baselines. Under this hypothesis, we analyze the neutrino
data from SN1987A, and find a mild preference for a non-zero mass-squared
difference. The same data can also be used to exclude values of $\delta m^2\sim
10^{-20}{\rm eV}^2$ - the smallest constrained so far. We also discuss how
next-generation experiments like the DUNE and Hyper-Kamiokande can probe this
scenario for a future galactic supernova.