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Unusual Near-horizon Cosmic-ray-like Events Observed by ANITA-IV

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arxiv 2008.05690 v3 pith:YCKXKMBR submitted 2020-08-13 astro-ph.HE

ANITA Collaboration: P. W. Gorham , A. Ludwig , C. Deaconu , P. Cao , P. Allison , O. Banerjee , L. Batten , D. Bhattacharya
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J. J. Beatty K. Belov W. R. Binns V. Bugaev C. H. Chen P. Chen Y. Chen J. M. Clem L. Cremonesi B. Dailey P. F. Dowkontt B. D. Fox J. W. H. Gordon C. Hast B. Hill S. Y. Hsu J. J. Huang K. Hughes R. Hupe M. H. Israel T.C. Liu L. Macchiarulo S. Matsuno K. McBride C. Miki 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 B. Rotter J. W. Russell D. Saltzberg D. Seckel H. Schoorlemmer J. Shiao S. Stafford J. Stockham M. Stockham B. Strutt M. S. Sutherland G. S. Varner A. G. Vieregg S. H. Wang S. A. Wissel
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classification astro-ph.HE
keywords eventsanomalousanita-ivbackgroundobservedpolarityseenanita
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abstract

ANITA's fourth long-duration balloon flight in late 2016 detected 29 cosmic-ray (CR)-like events on a background of $0.37^{+0.27}_{-0.17}$ anthropogenic events. CRs are mainly seen in reflection off the Antarctic ice sheets, creating a characteristic phase-inverted waveform polarity. However, four of the below-horizon CR-like events show anomalous non-inverted polarity, a $p = 5.3 \times 10^{-4}$ chance if due to background. All anomalous events are from locations near the horizon; ANITA-IV observed no steeply-upcoming anomalous events similar to the two such events seen in prior flights.

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Forward citations

Cited by 2 Pith papers

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    Dark matter scattering in the Earth, sourced by a flaring blazar, can explain the KM3-230213A event while yielding few or no IceCube events in a viable parameter space.

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