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We examine the feasibility of deriving neutrino mixing parameters $\delta$and $\theta_{13}$ from the cosmic neutrino flavor composition under theassumption that the flavor ratios of the cosmic neutrinos at the source were$F_{\nu_e}+F_{\bar{\nu}_e}:F_{\nu_\mu}+F_{\bar{\nu}_\mu}:F_{\nu_\tau}+F_{\bar{\nu}_\tau}=1:2:0$. We analyze various uncertainties thatenter the derivation of $\delta$ and $\theta_{13}$ from the ratio of theshower-like to $\mu$-tracks events which is the only realistic source ofinformation on the flavor composition at neutrino telescopes such as ICECUBE.We then examine to what extent the deviation of the initial flavor ratio from$1:2:0$ can be tested by measurement of this ratio at neutrino telescopestaking into account various sources of uncertainty.

An Analysis of Cosmic Neutrinos: Flavor Composition at Source and Neutrino Mixing Parameters