Tau energy loss and ultrahigh energy skimming tau neutrinos

Understand

We consider propagation of high energy earth-skimming taus produced in interactions of astrophysical tau neutrinos.

• For astrophysical tau neutrinos we take generic power-law flux, $E^{-2}$ and the cosmogenic flux initiated by the protons.
• We calculate tau energy loss in several approaches, such as dipole models and the phenomenological approach in which parameterization of the $F_2$ is used.
• We evaluate the tau neutrino charged-current cross section using the same approaches for consistency.