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. 2009 Jul 31;103(5):051103.
doi: 10.1103/PhysRevLett.103.051103. Epub 2009 Jul 30.

New limits on the ultrahigh energy cosmic neutrino flux from the ANITA experiment

P W Gorham  1 , P Allison, S W Barwick, J J Beatty, D Z Besson, W R Binns, C Chen, P Chen, J M Clem, A Connolly, P F Dowkontt, M A Duvernois, R C Field, D Goldstein, A Goodhue, C Hast, C L Hebert, S Hoover, M H Israel, J Kowalski, J G Learned, K M Liewer, J T Link, E Lusczek, S Matsuno, B C Mercurio, C Miki, P Miocinović, J Nam, C J Naudet, J Ng, R J Nichol, K Palladino, K Reil, A Romero-Wolf, M Rosen, L Ruckman, D Saltzberg, D Seckel, G S Varner, D Walz, Y Wang, F Wu; ANITA Collaboration
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Free article

New limits on the ultrahigh energy cosmic neutrino flux from the ANITA experiment

P W Gorham et al. Phys Rev Lett. .
Free article

Abstract

We report initial results of the first flight of the Antarctic Impulsive Transient Antenna (ANITA-1) 2006-2007 Long Duration Balloon flight, which searched for evidence of a diffuse flux of cosmic neutrinos above energies of E(nu) approximately 3 x 10(18) eV. ANITA-1 flew for 35 days looking for radio impulses due to the Askaryan effect in neutrino-induced electromagnetic showers within the Antarctic ice sheets. We report here on our initial analysis, which was performed as a blind search of the data. No neutrino candidates are seen, with no detected physics background. We set model-independent limits based on this result. Upper limits derived from our analysis rule out the highest cosmogenic neutrino models. In a background horizontal-polarization channel, we also detect six events consistent with radio impulses from ultrahigh energy extensive air showers.

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