Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraints on Neutrino Lifetime from the Sudbury Neutrino Observatory   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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The categories of this paper are: math-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
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The categories of this paper are: adap-org
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The categories of this paper are: astro-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: acc-phys