Search for a diffuse flux of astrophysical muon neutrinos with the IceCube 59-string configuration

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M.G. Aartsen, R. Abbasi, M. Ackermann, J. Admas, J.A. Aguilar, M. Ahlers, D. Altmann, C. Arguelles, T.C. Arlen, J. Auffenberg, X. Bai, M. Baker, Subir Sarkar, David Jason Koskinen, Michael James Larson

A search for high-energy neutrinos was performed using data collected by the IceCube Neutrino Observatory from May 2009 to May 2010, when the array was running in its 59-string configuration. The data sample was optimized to contain muon neutrino induced events with a background contamination of atmospheric muons of less than 1%. These data, which are dominated by atmospheric neutrinos, are analyzed with a global likelihood fit to search for possible contributions of prompt atmospheric and astrophysical neutrinos, neither of which have yet been identified. Such signals are expected to follow a harder energy spectrum than conventional atmospheric neutrinos. In addition, the zenith angle distribution differs for astrophysical and atmospheric signals. A global fit of the reconstructed energies and directions of observed events is performed, including possible neutrino flux contributions for an astrophysical signal and atmospheric backgrounds as well as systematic uncertainties of the experiment and theoretical predictions. The best fit yields an astrophysical signal flux for ν_μ+ν¯_μ of E^2⋅Φ(E) = 0.25x10^−8 GeV cm^−2 s^−1 sr^−1, and a zero prompt component. Although the sensitivity of this analysis for astrophysical neutrinos surpasses the Waxman and Bahcall upper bound, the experimental limit at 90% confidence level is a factor of 1.5 above at a flux of E^2⋅Φ(E) = 1.44x10^−8 GeV cm^−2 s^−1 sr^−1.
Original languageEnglish
Article number062007
JournalPhysical Review D (Particles, Fields, Gravitation and Cosmology)
Volume89
Number of pages19
ISSN1550-7998
DOIs
Publication statusPublished - 25 Mar 2014

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