Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-09-27
Phys.Rev.D77:013001,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages and 11 figures
Scientific paper
10.1103/PhysRevD.77.013001
We evaluate both the tau lepton energy loss produced by photonuclear interactions and the neutrino charged current cross section at ultra-high energies, relevant to neutrino bounds with Earth-skimming tau neutrinos, using different theoretical and phenomenological models for nucleon and nucleus structure functions. The theoretical uncertainty is estimated by taking different extrapolations of the structure function F2 to very low values of x, in the low and moderate Q2 range for the tau lepton interaction and at high Q2 for the neutrino-nucleus inelastic cross section. It is at these extremely low values of x where nuclear shadowing and parton saturation effects are unknown and could be stronger than usually considered. For tau and neutrino energies E=10^9 GeV we find uncertainties of a factor 4 for the tau energy loss and of a factor 2 for the charged current neutrino-nucleus cross section.
Armesto Nestor
Merino Carlos
Parente Gonzalo
Zas Enrique
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