TeV strings and ultrahigh-energy cosmic rays Illana Calero, José Ignacio Presented at the XXV International School of Theoretical Physics "Particles and Astrophysics - Standar Models and Beyond", Ustron, Poland, september 10-16, 2001. The origin and nature of ultrahigh-energy cosmic ray events, above the Greisen–Zatsepin–Kuzmin (GZK) cutoff energy, constitute a long-standing, unsolved mystery. Neutrinos are proposed candidates but their standard interactions with matter are too weak. In the context of a TeV-scale string theory, motivated by possible extra space dimensions, the neutrino–nucleon scattering is examined. Resonant string contributions increase substantially the standard model neutrino-nucleon cross section. Although they seem insufficient to explain the trans-GZK cosmic ray events, their effects might be detected in next experiments. 2014-07-03T10:16:24Z 2014-07-03T10:16:24Z 2001 journal article Illana, J.I. TeV strings and ultrahigh-energy cosmic rays. Acta Physica Polonica B, 32(11): 3695-3706 (2001). [http://hdl.handle.net/10481/32444] 0587-4254 http://hdl.handle.net/10481/32444 eng http://creativecommons.org/licenses/by-nc-nd/3.0/ open access Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License Jagiellonian University