159 articles – 2002 Notices  [english version]
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CRIS 2008 - Cosmic Ray International Seminar Origin, Mass Composition and Acceleration Mechanisms of UHECRs, Malfa : Italie (2008)
The propagation of ultra-high energy tau leptons and neutrinos while skimming the Earth
O. Blanch Bigas1, O. Deligny2, K. Payet3, V. Van Elewyck2, 4

The detection of Earth-skimming tau neutrinos has turned into a very promising strategy for the observation of UHE cosmic neutrinos. The sensitivity of this channel crucially depends on the parameters of the propagation of the tau neutrino (and the tau lepton) through the terrestrial crust, which governs the flux of emerging tau leptons that can be detected. This propagation problem is usually treated in a simplified framework where several effects are neglected, e.g. the possibility of multiple regenerations of the tau neutrino, the weak interactions of the tau lepton, as well as the stochastic nature of its energy losses. We discuss here the validity of such approximations by studying the propagation in standard rock of tau leptons and neutrinos with both mono-energetic and power-law spectra. We also investigate the impact of such simplifications in non-standard scenarios for the neutrino-nucleon interactions as well as for the tau energy losses.
1 :  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
2 :  IPNO - Institut de Physique Nucléaire d'Orsay
3 :  LPSC - Laboratoire de Physique Subatomique et de Cosmologie
4 :  APC - UMR 7164 - AstroParticule et Cosmologie
Physique/Physique des Hautes Energies - Phénoménologie
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