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First search for extremely high energy cosmogenic neutrinos with the IceCube Neutrino Observatory

Abstract:

We report on the results of the search for extremely-high energy neutrinos with energies above 10 7 GeV obtained with the partially (∼ 30%) constructed IceCube in 2007. From the absence of signal events in the sample of 242.1 days of effective live time, we derive a 90% CL model independent differential upper limit based on the number of signal events per energy decade at E 2 ϕ ν e+ ν μ+ ν τ≃ 1.4× 10− 6 GeV cm− 2 sec− 1 sr− 1 for neutrinos in the energy range from 3× 10 7 to 3× 10 9 GeV.