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Observation of an Unusual Upward-Going Cosmic-Ray-like Event in the Third Flight of ANITA

Gorham, PW; Rotter, B; Allison, P; Banerjee, O; Batten, L; Beatty, JJ; Bechtol, K; ... Wissel, SA; + view all (2018) Observation of an Unusual Upward-Going Cosmic-Ray-like Event in the Third Flight of ANITA. Physical Review Letters , 121 (16) , Article 161102. 10.1103/PhysRevLett.121.161102. Green open access

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Abstract

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 could be produced by the atmospheric decay of an upward-propagating τ lepton produced by a ν τ interaction, although their relatively steep arrival angles create tension with the standard model neutrino cross section. Each of the two events have a posteriori background estimates of ≲ 10 − 2 events. If these are generated by τ -lepton decay, then either the charged-current ν τ 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

Type: Article
Title: Observation of an Unusual Upward-Going Cosmic-Ray-like Event in the Third Flight of ANITA
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.121.161102
Publisher version: http://doi.org/10.1103/PhysRevLett.121.161102
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: http://discovery.ucl.ac.uk/id/eprint/10061093
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