Ultrahigh energy neutrino interactions and weak-scale string theories

Details Ultrahigh energy neutrino interactions and weak-scale string theories Ultrahigh energy neutrino interactions and weak-scale string theories

2000-05-15

arxiv.org/abs/astro-ph/0005309v2

Phys.Rev. D62 (2000) 103006

Astronomy and Astrophysics

Astrophysics

7 pages, 3 figures; discussion of the sensitivity of Auger/Owl shortened, matches version to be published

Scientific paper

10.1103/PhysRevD.62.103006

It has been suggested that ultrahigh energy neutrinos can acquire cross-sections approaching hadronic size if the string scale is as low as 1-10 TeV. In this case, the vertical air showers observed with energies above the Greisen-Zatsepin-Kuzmin cutoff at E approximately 6x10^{19} eV could be initiated by neutrinos which are the only known primaries able to travel long distances unimpeded. We have calculated the neutrino-nucleon cross-section due to the exchange of Kaluza-Klein excitations of the graviton in a field theoretical framework. We have found that the neutrino-nucleon cross section and the transferred energy per interaction are too small to explain vertical showers even in the most optimistic scenario.

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