First search for atmospheric and extraterrestrial neutrino-induced cascades with the IceCube detector

First search for atmospheric and extraterrestrial neutrino-induced cascades with the IceCube detector

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We report on the first search for atmospheric and for diffuse astrophysical neutrino-induced showers (cascades) in the IceCube detector using 257 days of data collected in the year 2007-2008 with 22 strings active. A total of 14 events with energies above 16TeV remained after event selections in the...

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Bibliographic Details
Main Authors: Abbasi, R, Abdou, Y, Abu-Zayyad, T, Adams, J, Aguilar, J, Ahlers, M, Andeen, K, Auffenberg, J, Bai, X, Baker, M, Barwick, S, Bay, R, Bazo Alba, J, Beattie, K, Beatty, J, Bechet, S, Becker, J, Becker, K, Benabderrahmane, M, Benzvi, S, Berdermann, J, Berghaus, P, Berley, D, Bernardini, E, Bertrand, D
Format: Journal article
Language:English
Published: 2011
Description
Summary:We report on the first search for atmospheric and for diffuse astrophysical neutrino-induced showers (cascades) in the IceCube detector using 257 days of data collected in the year 2007-2008 with 22 strings active. A total of 14 events with energies above 16TeV remained after event selections in the diffuse analysis, with an expected total background contribution of 8.3±3.6. At 90% confidence we set an upper limit of E2Φ90%CL<3. 6×10-7GeV•cm-2•s-1•sr -1 on the diffuse flux of neutrinos of all flavors in the energy range between 24TeV and 6.6PeV assuming that ΦE-2 and the flavor composition of the νeνμντ flux is 111 at the Earth. The atmospheric neutrino analysis was optimized for lower energies. A total of 12 events were observed with energies above 5TeV. The observed number of events is consistent with the expected background, within the uncertainties. © 2011 American Physical Society.

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