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First Observation of PeV-Energy Neutrinos with IceCube
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2013 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 111, no 2, 021103- p.Article in journal (Refereed) Published
Abstract [en]

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 nu(e,mu,tau) ((nu) over bar (e,mu,tau)) or charged-current nu(e) ((nu) over bar (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 x 10(-3) (2.8 sigma) 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.

Place, publisher, year, edition, pages
2013. Vol. 111, no 2, 021103- p.
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Natural Sciences
URN: urn:nbn:se:uu:diva-204859DOI: 10.1103/PhysRevLett.111.021103ISI: 000321674500001OAI: oai:DiVA.org:uu-204859DiVA: diva2:640122
Available from: 2013-08-12 Created: 2013-08-12 Last updated: 2015-06-24Bibliographically approved

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Boersma, David J.Botner, OlgaHallgren, Allande los Heros, Carlos PerezStröm, RickardTaavola, Henric
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