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We propose a new method to identify flavors of ultra high energy cosmicneutrinos. Energy loss of leptons in matter provides important informations forthe detection of neutrinos originated from high energy astrophysical sources.50 years ago, Askaryan proposed to detect Cherenkov signals by radio wave fromthe negative charge excess of particle showers. The theory of Cherenkov pulseswith Fraunhofer approximation was widely studied in the past two decades.However, at high energies or for high density materials, electromagnetic showershould be elongated due to the Landau-Pomeranchuck-Migdal (LPM) effect. As suchthe standard Fraunhofer approximation ceases to be valid when the distancebetween the shower and the detector becomes comparable with the shower length.We have performed Monte Carlo simulations recently to investigate this regimebased on the finite-difference time-domain (FDTD) method, and modified timedomain integration method. In this work, we adopt the deduced relationshipbetween the radio signal and the cascade development profile to investigate itsimplication to lepton signatures. Our method provides a straightforwardtechnique to identify the neutrino flavor through the detected Cherenkovsignals.

The Strategy of Discrimination between Flavors for Detection of Cosmogenic Neutrinos