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New Limits on the Ultrahigh Energy Cosmic Neutrino Flux from the ANITA Experiment.
PHYS REV LETT
, Article 051103. 10.1103/PhysRevLett.103.051103.
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 similar or equal to 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.
|Title:||New Limits on the Ultrahigh Energy Cosmic Neutrino Flux from the ANITA Experiment|
|Open access status:||An open access version is available from UCL Discovery|
|Additional information:||© 2009 The American Physical Society|
|Keywords:||RAY AIR-SHOWERS, COHERENT RADIO EMISSION, SPECTRUM, DETECTOR, CHARGE|
|UCL classification:||UCL > School of Life and Medical Sciences > Faculty of Medical Sciences > Surgery and Interventional Science (Division of)
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy
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