TeV Strings and Ultrahigh-Energy Cosmic Rays

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

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12 pages, LaTeX, 2 figures; talk presented at the XXV International School of Theoretical Physics, Ustron, Poland, September 1

Scientific paper

The origin and nature of ultrahigh-energy cosmic ray events, above the Greisen-Zatsepin-Kuzmin (GZK) cutoff energy, constitute a long-standing, unsolved mistery. 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.

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