Decay of high-energy astrophysical neutrinos.

  title={Decay of high-energy astrophysical neutrinos.},
  author={John F. Beacom and Nicole F. Bell and Dan Hooper and Sandip Pakvasa and Thomas J. Weiler},
  journal={Physical review letters},
  volume={90 18},
Existing limits on the nonradiative decay of one neutrino to another plus a massless particle (e.g., a singlet Majoron) are very weak. The best limits on the lifetime to mass ratio come from solar neutrino observations and are tau/m greater, similar 10(-4) s/eV for the relevant mass eigenstate(s). For lifetimes even several orders of magnitude longer, high-energy neutrinos from distant astrophysical sources would decay. This would strongly alter the flavor ratios from the phi(nu(e)):phi(nu(mu… 
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