Review Article

Ultrahigh Energy Neutrinos at the Pierre Auger Observatory

Table 3

Main sources of systematic uncertainty and their impact on the Earth-skimming [32] and downward-going [33] exposures.

Source of uncertainty Earth-skimming Downward-going

Monte Carlo simulation of shower +20%, −5% +9%, −33%
-nucleon cross-section +5%, −9% +7%, −7%
energy losses +25%, −10% +6%, −6%
Topography +18%, 0%