Characteristics of Four Upward-Pointing Cosmic-Ray-like Events Observed with ANITA

P. W. Gorham, J. Nam, A. Romero-Wolf, S. Hoover, P. Allison, O. Banerjee, J. J. Beatty, K. Belov, D. Z. Besson, W. R. Binns, V. Bugaev, P. Cao, C. Chen, P. Chen, J. M. Clem, A. Connolly, B. Dailey, C. Deaconu, L. Cremonesi, P. F. DowkonttM. A. Duvernois, R. C. Field, B. D. Fox, D. Goldstein, J. Gordon, C. Hast, C. L. Hebert, B. Hill, K. Hughes, R. Hupe, M. H. Israel, A. Javaid, J. Kowalski, J. Lam, J. G. Learned, K. M. Liewer, T. C. Liu, J. T. Link, E. Lusczek, S. Matsuno, B. C. Mercurio, C. Miki, P. Miočinović, M. Mottram, K. Mulrey, C. J. Naudet, J. Ng, R. J. Nichol, K. Palladino, B. F. Rauch, ANITA Collaboration

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Abstract

We report on four radio-detected cosmic-ray (CR) or CR-like events observed with the Antarctic Impulsive Transient Antenna (ANITA), a NASA-sponsored long-duration balloon payload. Two of the four were previously identified as stratospheric CR air showers during the ANITA-I flight. A third stratospheric CR was detected during the ANITA-II flight. Here, we report on characteristics of these three unusual CR events, which develop nearly horizontally, 20-30 km above the surface of Earth. In addition, we report on a fourth steeply upward-pointing ANITA-I CR-like radio event which has characteristics consistent with a primary that emerged from the surface of the ice. This suggests a possible τ-lepton decay as the origin of this event, but such an interpretation would require significant suppression of the standard model τ-neutrino cross section.

Original languageEnglish (US)
Article number071101
JournalPhysical review letters
Volume117
Issue number7
DOIs
StatePublished - Aug 8 2016

Bibliographical note

Publisher Copyright:
© 2016 American Physical Society.

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