Detecting earth-skimming and mountain-penetrating tau neutrinos

Abstract

In this talk, we discuss issues relevant to the detections of Earth-skimming/mountain-penetrating tau neutrinos. We first argue that there are non-negligible astrophysical tau neutrino fluxes due to neutrino flavor oscillations. We then discuss the rationale for detecting Earth-skimming and mountain-penetrating tau neutrinos. The nu(tau) --> tau conversion efficiencies and the tau-lepton event rate are presented.