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arXiv · 2310.02763

Possible explanation of not observing ultra-high energy cosmic neutrinos

Jakub Rembielinski·Jacek Ciborowski
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Abstract

Assuming that neutrinos are spacelike (tachyonic) fermions, we calculate width for the kinematically allowed, lepton number conserving, three-body decay $ν_α\rightarrow ν_α \; ν_β \barν_β$ in the Standard Model. Decays of tachyonic neutrinos over cosmological distances can lead to a reduction of the neutrino flux in the high-energy end of the spectrum. We estimate upper limits on the spacelike neutrino mass based on the PeV-energy cosmological neutrino events observed in the IceCube experiment. These limits are close to those deduced from the measurements of $m_ν^2$ in the tritium-decay experiment KATRIN.

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Jakub Rembielinski, Jacek Ciborowski. 2023-10-04. Possible explanation of not observing ultra-high energy cosmic neutrinos. https://arxiv.org/abs/2310.02763

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