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Ackermann, M; Aguilar, J A; Altmann, D; Bai, X; Beatty, J J; Becker, K-H; Bell, M; BenZvi, S; Berdermann, J; Berley, D; Bernardini, E; Bindig, D; Blumenthal, J; Boersma, D J; Bose, D; Böser, S; Brown, A M; Bruijn, R; Chirkin, D; Christy, B; Cowen, D F; Danninger, M; Daughhetee, J; Davis, J C; De Clercq, C; Díaz-Vélez, J C; Eagan, R; Evenson, P A; Fadiran, O; Feusels, T; Finley, C; Frantzen, K; Gaisser, T K; Glüsenkamp, T; Grant, D; Hallen, P; Halzen, F; Heereman, D; Hickford, S; Hill, G C; Hoffman, K D; Hoshina, K; Jacobsen, J; Jagielski, K; Japaridze, G S; Kaminsky, B; Karg, T; Kiryluk, J; Klein, S R; Kolanoski, H; Koskinen, D J; Kowalski, M; Krasberg, M; Landsman, H; Lesiak-Bzdak, M; Leute, J; Madsen, J; Maruyama, R; Mase, K; Matis, H S; Meagher, K; Miarecki, S; Montaruli, T; Nahnhauer, R; Nowicki, S C; Obertacke, A; Olivas, A; Paul, L; Pepper, J A; Pieloth, D; Pinat, E; Pirk, N; Posselt, J; Rädel, L; Redl, P; Ribordy, M; Saba, S M; Scheriau, F; Schönwald, A; Schukraft, A; Schulte, L; Sheremata, C; Smith, M W E; Stasik, A; Strahler, E A; Ström, R; Ter-Antonyan, S; Usner, M; van Eijndhoven, N; Wasserman, R; Wellons, M; Wendt, C; Westerhoff, S; Wiebusch, C H; Williams, D R; Wolf, M; Xu, X W; Yanez, J P; Zarzhitsky, P; Zierke, S
Physical review letters, 2013-Jul-12, Letnik: 111, Številka: 2Journal Article
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) (ν(e,μ,τ)) or charged-current ν(e) (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.
