2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/161035We evaluate both the tau lepton energy loss produced by photonuclear interactions and the neutrino charged current cross section at ultra-high energies, both relevant to neutrino bounds with Earth-skimming tau neutrinos.Contribution to the Proceedings of the XLIII Rencontres de Moriond: QCD and High Energy Interactions, La Thulile, Italy, 8-15 March 2008. Talk presented by G. Parente (4 pages and 3 figures)High Energy Physics - Phenomenologytext