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First Observation of PeV-Energy Neutrinos with IceCube
Aartsen, M. G. Besson, David Zeke IceCube Collaboration
Aartsen, M. G.
Besson, David Zeke
IceCube Collaboration
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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 νe,μ,τ (ν¯e,μ,τ) or charged-current νe (ν¯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)+0.041−0.057(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.
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2013-07-08
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American Physical Society
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Aartsen et al. (IceCube Collaboration) "First Observation of PeV-Energy Neutrinos with IceCube." Phys. Rev. Lett. 111, 021103 – Published 8 July 2013 http://dx.doi.org/10.1103/PhysRevLett.111.021103