2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/43969Some supersymmetric models predicted long lived charged sleptons. Following Albuquerque, Burdman and Chacko \cite{albu}, we consider an exact process where the $ \widetildeτ$, the supersymmetry partner of $τ$ lepton, are produced inside the earth by collisions of high energy neutrinos with nucleons. We detailedly investigate the possible signals of upgoing $ \widetildeτ$ by comparing with the background muons where atmospheric neutrino flux is taken into account. The realistic spectra shows that km-scale experiments could see as many as 69 events a year by using the Waxman-Bahcall limit on the extraterrestrial neutrino flux.11 pages, 5figures. The revised parts added proper citationsHigh Energy Physics - Phenomenologytext