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Constraints on Neutrino Lifetime from the Sudbury Neutrino Observatory
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abstract
The long baseline between the Earth and the Sun makes solar neutrinos an excellent test beam for exploring possible neutrino decay. The signature of such decay would be an energy-dependent distortion of the traditional survival probability which can be fit for using well-developed and high precision analysis methods. Here a model including neutrino decay is fit to all three phases of $^8$B solar neutrino data taken by the Sudbury Neutrino Observatory. This fit constrains the lifetime of neutrino mass state $\nu_2$ to be ${>8.08\times10^{-5}}$ s/eV at $90\%$ confidence. An analysis combining this SNO result with those from other solar neutrino experiments results in a combined limit for the lifetime of mass state $\nu_2$ of ${>1.04\times10^{-3}}$ s/eV at $99\%$ confidence.
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Cited by 1 Pith paper
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Invisible decay of solar neutrinos at dark matter experiments
Combining XENONnT, PandaX-4T, and LZ data gives the first CEνNS-based limit on invisible solar-neutrino decay, and a future xenon detector could beat dedicated solar experiments by 1 to 2 orders of magnitude.
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