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

  • P. W. Gorham
  • , B. Rotter
  • , P. Allison
  • , O. Banerjee
  • , L. Batten
  • , J. J. Beatty
  • , K. Bechtol
  • , K. Belov
  • , D. Z. Besson
  • , W. R. Binns
  • , V. Bugaev
  • , P. Cao
  • , C. C. Chen
  • , C. H. Chen
  • , P. Chen
  • , J. M. Clem
  • , A. Connolly
  • , L. Cremonesi
  • , B. Dailey
  • , C. Deaconu
  • P. F. Dowkontt, B. D. Fox, J. W.H. Gordon, C. Hast, B. Hill, K. Hughes, J. J. Huang, R. Hupe, M. H. Israel, A. Javaid, J. Lam, K. M. Liewer, S. Y. Lin, T. C. Liu, A. Ludwig, L. Macchiarulo, S. Matsuno, C. Miki, K. Mulrey, J. Nam, C. J. Naudet, R. J. Nichol, A. Novikov, E. Oberla, M. Olmedo, R. Prechelt, S. Prohira, B. F. Rauch, J. M. Roberts, A. Romero-Wolf, J. W. Russell, D. Saltzberg, D. Seckel, H. Schoorlemmer, J. Shiao, S. Stafford, J. Stockham, M. Stockham, B. Strutt, G. S. Varner, A. G. Vieregg, S. H. Wang, S. A. Wissel

Research output: Contribution to journalArticlepeer-review

136 Scopus citations

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 ντ 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 ντ 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.

Original languageEnglish
Article number161102
JournalPhysical Review Letters
Volume121
Issue number16
DOIs
StatePublished - Oct 18 2018

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