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Observation of an Unusual Upward-going Cosmic-ray-like Event in the Third Flight of ANITA
We report on an upward traveling, radio-detected cosmic-ray-like impulsive event with characteristics closely matching an extensive air shower. This event, observed in the third flight of the Antarctic Impulsive Transient Antenna (ANITA), a NASA-sponsored long-duration balloon payload, is consistent...
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Published in: | arXiv.org 2018-03 |
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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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Summary: | We report on an upward traveling, radio-detected cosmic-ray-like impulsive event with characteristics closely matching an extensive air shower. This event, observed in the third flight of the Antarctic Impulsive Transient Antenna (ANITA), a NASA-sponsored long-duration balloon payload, is consistent with a similar event reported in a previous flight. These events may be produced by the atmospheric decay of an upward-propagating \(\tau\)-lepton produced by a \(\nu_{\tau}\) interaction, although their relatively steep arrival angles create tension with the standard model (SM) neutrino cross section. Each of the two events have \(a~posteriori\) background estimates of \(\lesssim 10^{-2}\) events. If these are generated by \(\tau\)-lepton decay, then either the charged-current \(\nu_{\tau}\) cross section is suppressed at EeV energies, or the events arise at moments when the peak flux of a transient neutrino source was much larger than the typical expected cosmogenic background neutrinos. |
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ISSN: | 2331-8422 |
DOI: | 10.48550/arxiv.1803.05088 |