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First Observation of PeV-Energy Neutrinos with IceCube

CollaborationWith : Aguilar Sanchez, Juan / Christov, Asen / Montaruli, Teresa / Rameez, Mohamed
Published in Physical Review Letters. 2013, vol. 111, no. 02, p. 021103
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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ICECUBE COLLABORATION. First Observation of PeV-Energy Neutrinos with IceCube. In: Physical Review Letters, 2013, vol. 111, n° 02, p. 021103. https://archive-ouverte.unige.ch/unige:39080

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Deposited on : 2014-08-04

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