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Testing the Number of Neutrino Species with a Global Fit of Neutrino Data
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Testing the Number of Neutrino Species with a Global Fit of Neutrino Data
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We present the first experimental constraints on models with many additional neutrino species in an analysis of current neutrino data. These types of models are motivated as a solution to the hierarchy problem by lowering the species scale of gravity to TeV. Additionally, they offer a natural mechanism to generate small neutrino masses and provide interesting dark matter candidates. This study analyzes data from DayaBay, KamLAND, MINOS, NOvA and KATRIN. We do not find evidence for the presence of any additional neutrino species, therefore we report lower bounds on the allowed number of neutrino species realized in nature. For the normal/inverted neutrino mass ordering, we can give a lower bound on the number of neutrino species of O(30) and O(100), respectively, over a large range of the parameter space.
Forward citations
Cited by 3 Pith papers
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Atmospheric Neutrino Oscillations: the Full Picture
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Neutrino data rule out the Majorana realization of N-naturalness with up to 10^4 sectors and fine-tuning r ≥ 0.1, including the no-fine-tuning GUT benchmark.
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Neutrino Masses and Phenomenology in Nnaturalness
Nnaturalness generates neutrino mass matrices through multi-sector mixing, excludes democratic couplings, and yields a tower of neutrino eigenstates with theory-determined mass splittings.
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