Abstract
We summarize results from the third flight of the Antarctic Impulsive Transient Antenna (ANITA), a NASA long-duration balloon payload that searches for radio emission from the interactions of ultra-high-energy neutrinos and cosmic rays. ANITAIII was launched in December 2014 and flew for 22 days. We report the results from multipleanalyses of the data, which search for Askaryan radio emission from neutrinos interacting in the Antarctic ice as well as geomagnetic radio emission from extensive air showers (EASs) induced by cosmic rays or a tau lepton created in an in-earth tau neutrino interaction. In the most sensitive Askaryan neutrino search, we find one eventon a pre-unblinding background of 0:7−0:3+0.5. Across all searches, including a dedicated EAS search, we find a total of 28 EAS-like events. One of these events is consistent with an upward-traveling EAS, with a post-unblinding background estimate of ⪷10−2.
Highlights
The Antarctic Impulsive Transient Antenna (ANITA), a NASA long-duration balloon payload, monitors the Antarctic ice sheet for impulsive, broadband radio emission (180 - 1200 MHz) caused by high-energy astrophysical and cosmogenic neutrino and cosmic-ray interactions
The first is Askaryan emission from neutrino-induced cascades in the Antarctic ice, which appears as a vertically-polarized signal at the ANITA payload due to geometric effects combined with the radial polarization of the Cherenkov cone and Fresnel effects at the surface
We have performed four separate analyses of data from ANITA-III, each searching for Askaryan neutrino candidate events and/or extensive air showers (EASs) candidate events
Summary
The Antarctic Impulsive Transient Antenna (ANITA), a NASA long-duration balloon payload, monitors the Antarctic ice sheet for impulsive, broadband radio emission (180 - 1200 MHz) caused by high-energy astrophysical and cosmogenic neutrino and cosmic-ray interactions. ANITA is sensitive to two types of impulsive particle-induced radio signals. The first is Askaryan emission from neutrino-induced cascades in the Antarctic ice, which appears as a vertically-polarized signal at the ANITA payload due to geometric effects combined with the radial polarization of the Cherenkov cone and Fresnel effects at the surface.
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