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Type: Journal article
Title: First observation of PeV-energy neutrinos with IceCube
Author: Aartsen, M.
Hill, G.
Citation: Physical Review Letters, 2013; 111(2):1-7
Publisher: American Physical Soc
Issue Date: 2013
ISSN: 0031-9007
Statement of
M. G. Aartsen ... G. C. Hill ... et al. (IceCube Collaboration)
Abstract: We report on the observation of two neutrino-induced events which have an estimated deposited energy in the IceCube detector of 1.04±0.16 and 1.14±0.17 PeV, respectively, the highest neutrino energies observed so far. These events are consistent with fully contained particle showers induced by neutral-current ν(e,μ,τ) (ν̅ (e,μ,τ)) or charged-current ν(e) (ν̅ e) interactions within the IceCube detector. The events were discovered in a search for ultrahigh energy neutrinos using data corresponding to 615.9 days effective live time. The expected number of atmospheric background is 0.082±0.004(stat)₋₀.₀₅₇⁺⁰.⁰⁴¹ (syst). The probability of observing two or more candidate events under the atmospheric background-only hypothesis is 2.9×10⁻³ (2.8σ) taking into account the uncertainty on the expected number of background events. These two events could be a first indication of an astrophysical neutrino flux; the moderate significance, however, does not permit a definitive conclusion at this time.
Keywords: IceCube Collaboration
Rights: © 2013 American Physical Society
RMID: 0020130781
DOI: 10.1103/PhysRevLett.111.021103
Appears in Collections:Chemistry and Physics publications

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