Charged Current Neutrino Cross Section and Tau Energy Loss at Ultra-High Energies

Details Charged Current Neutrino Cross Section and Tau Energy Loss at Ultra-High Energies Charged Current Neutrino Cross Section and Tau Energy Loss at Ultra-High Energies

2007-09-27

arxiv.org/abs/0709.4461v2

Phys.Rev.D77:013001,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages and 11 figures

Scientific paper

10.1103/PhysRevD.77.013001

We evaluate both the tau lepton energy loss produced by photonuclear interactions and the neutrino charged current cross section at ultra-high energies, relevant to neutrino bounds with Earth-skimming tau neutrinos, using different theoretical and phenomenological models for nucleon and nucleus structure functions. The theoretical uncertainty is estimated by taking different extrapolations of the structure function F2 to very low values of x, in the low and moderate Q2 range for the tau lepton interaction and at high Q2 for the neutrino-nucleus inelastic cross section. It is at these extremely low values of x where nuclear shadowing and parton saturation effects are unknown and could be stronger than usually considered. For tau and neutrino energies E=10^9 GeV we find uncertainties of a factor 4 for the tau energy loss and of a factor 2 for the charged current neutrino-nucleus cross section.

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