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

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

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sf2a.conf..255p&link_type=abstract

"SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel, F. Combes

Astronomy and Astrophysics

Astrophysics

Scientific paper

The Pierre Auger Observatory is able to discriminate showers induced by Ultra High Energy neutrinos from every other primaries. More particularly, it is sensitive to Earth-skimming ν_τ that interact in the Earth's crust to produce a tau; lepton that may emerge and trigger an extensive air shower used to sign the presence of the initial neutrino. The data from 1 January 2004 to 31 August 2007 contains no such neutrino candidate, but is used to place a limit on the flux of ν_τ at EeV energies. The result from the Pierre Auger Observatory gives a limit in the energy range 2× 10^{17} eV < E_ν < 2× 10^{19} eV for an E^{-2}_ν differential energy spectrum. The limit set at 90% C.L. is E^{-2}_ν dN_{ν_τ}/dE_ν < 1.3 × 10^{-7} GeV cm^{-2} s^{-1} sr^{-1}.

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