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Inferring neutrino cross sections above 10^19 eV

Sergio Palomares-Ruiz
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Abstract

Extremely high energy neutrinos propagating in the atmosphere or in the Earth can originate horizontal or upgoing air-showers, respectively. We calculate the acceptances (event rate/flux) for detecting both types of events by fluorescence detectors, both space-based as with the EUSO and OWL proposals, and ground-based, as with Auger, HiRes and Telescope Array. We depict them as a function of the neutrino-nucleon cross section and show that from the ratio of these two classes of events, the inference of the cross section above 10^{19} eV appears feasible, assuming that a neutrino flux exists at these energies. Our semi-analytic calculation includes realistic energy-losses for tau leptons and Earth-curvature effects. We also consider constraints on shower development and identification and the effects of a cloud layer.

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Sergio Palomares-Ruiz. 2006-12-05. Inferring neutrino cross sections above 10^19 eV. https://arxiv.org/abs/hep-ph/0612051

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