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Gordon, J. W. Russell, K. Belov, K. Hughes, K. McBride, L. Batten, L. Cremonesi, L. Macchiarulo, M. H. Israel, M. Olmedo, M. S. Sutherland, M. Stockham, O. Banerjee, P. Allison, P. Cao, P. Chen, P. F. Dowkontt, R. Hupe, R. J. Nichol, R. Prechelt, S. A. Wissel, S. H. Wang, S. Matsuno, S. Prohira, S. Stafford, S. Y. Hsu, T.C. Liu, V. Bugaev, W. R. Binns, Y. Chen","submitted_at":"2020-08-13T04:49:27Z","abstract_excerpt":"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. 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