We have previously shown that the decay of high-energy neutrinos from distant astrophysical sources would be revealed by flavor ratios that deviate strongly from the ${\phi }_{{\nu }_e}:{\phi }_{{\nu }_{\mu }}:{\phi }_{{\nu }_{\tau }}=1:1:1\mathrm{}$ expected from oscillations alone. Here we show that the deviations are significantly larger when the mixing angle ${\theta }_{13}$ and the CP phase $\delta$ are allowed to be nonzero. If neutrinos decay, this could allow measurement of ${\theta }_{13}$ and $\delta$ in IceCube and other near-term neutrino telescopes.

• Received 23 September 2003

DOI:https://doi.org/10.1103/PhysRevD.69.017303