Towards Determination of the Initial Flavor Composition of Ultrahigh-energy Neutrino Fluxes with Neutrino Telescopes
نویسندگان
چکیده
We propose a simple but useful parametrization of the flavor composition of ultrahigh-energy neutrino fluxes produced from distant astrophysical sources: φe : φμ : φτ = sin 2 ξ cos2 ζ : cos2 ξ cos2 ζ : sin ζ. We show that it is possible to determine or constrain ξ and ζ by observing two independent neutrino flux ratios at the second-generation neutrino telescopes, provided three neutrino mixing angles and the Dirac CP-violating phase have been well measured in neutrino oscillations. Any deviation of ζ from zero will signify the existence of cosmic ντ and ντ neutrinos at the source, and an accurate value of ξ can be used to test both the conventional mechanism and the postulated scenarios for cosmic neutrino production.
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