First Observation of PeV-Energy Neutrinos with IceCube

Type Journal Article
Names M. G. Aartsen, R. Abbasi, Y. Abdou, M. Ackermann, J. Adams, J. A. Aguilar, M. Ahlers, D. Altmann, J. Auffenberg, X. Bai, M. Baker, S. W. Barwick, V. Baum, R. Bay, J. J. Beatty, S. Bechet, J. Becker Tjus, K.-H. Becker, M. Bell, M. L. Benabderrahmane,
Publication Physical Review Letters
Volume 111
Pages 21103
Journal Abbreviation Physical Review Letters
Date July 1, 2013
DOI 10.1103/PhysRevLett.111.021103
ISSN 0031-9007
URL http://adsabs.org/2013PhRvL.111b1103A
Library Catalog labs.adsabs.harvard.edu
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±0.17PeV, 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)-0.057+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.
Tags COSMIC RAYS, Neutrino muon pion and other elementary particle detectors, Neutrino muon pion and other elementary particles, cosmic ray detectors
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