Upper limit on the diffuse flux of UHE tau neutrinos from the Pierre Auger Observatory

Abstract

The surface detector array of the Pierre Auger Observatory is sensitive to Earth-skimming tau-neutrinos ${\nu }_{\tau }$ that interact in the Earth's crust. Tau leptons from ${\nu }_{\tau }$ charged-current interactions can emerge and decay in the atmosphere to produce a nearly horizontal shower with a significant electromagnetic component. The data collected between 1 January 2004 and 31 August 2007 is used to place an upper limit on the diffuse flux of ${\nu }_{\tau }$ at EeV energies. Assuming an $E_{\nu }^{-2}$ differential energy spectrum the limit set at 90 % C.L. is $E_{\nu }^2\mathrm{d}{N}_{{\nu }_{\tau }}/\mathrm{d}{E}_{\nu }<1.3\times 10^{-7}$ GeV cm${}^{-2}$ s${}^{-1}$ sr${}^{-1}$ in the energy range $2\times 10^{17}\mathrm{eV}<E_{\nu }<2\times 10^{19}$ eV.

14 pages, 3 figures

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