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Limit on the diffuse flux of ultrahigh energy tau neutrinos with the surface detector of the Pierre Auger Observatory
Data collected at the Pierre Auger Observatory are used to establish an upper limit on the diffuse flux of tau neutrinos in the cosmic radiation. Earth-skimming ${\ensuremath{\nu}}_{\ensuremath{\tau}}$ may interact in the Earth's crust and produce a $\ensuremath{\tau}$ lepton by means of charged-current interactions. The $\ensuremath{\tau}$ lepton may emerge from the …