Unusual Near-Horizon Cosmic-Ray-like Events Observed by ANITA-IV

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

doi:10.1103/physrevlett.126.071103

Title: Unusual Near-Horizon Cosmic-Ray-like Events Observed by ANITA-IV

Journal Article · Fri Feb 19 00:00:00 EST 2021 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.126.071103· OSTI ID:1777246

; Ludwig, A.; Deaconu, C.; Cao, P.; Allison, P.; Banerjee, O.; Batten, L.; Bhattacharya, D.; Beatty, J. J.; Belov, K.; Binns, W. R.; Bugaev, V.; Chen, C. H.; Chen, P.; Chen, Y.; Clem, J. M.; Cremonesi, L.; Dailey, B.; Dowkontt, P. F.; Fox, B. D. more »

ANITA’s fourth long-duration balloon flight in 2016 detected 29 cosmic-ray (CR)-like events on a background of ${0.37}_{- 0.17}^{+ 0.27}$ anthropogenic events. CRs are mainly seen in reflection off the Antarctic ice sheets, creating a phase-inverted waveform polarity. However, four of the below-horizon CR-like events show anomalous noninverted polarity, a $p = 5.3 \times 10^{- 4}$ chance if due to background. Furthermore, 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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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Aeronautics and Space Administration (NASA); Taiwan Ministry of Science and Technology (MOST)

Contributing Organization:: ANITA Collaboration

Grant/Contract Number:: AC02-76SF00515; NNX15AC24G; 106-2119-M-002-011

OSTI ID:: 1777246

Journal Information:: Physical Review Letters, Vol. 126, Issue 7; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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