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Volume 358 - 36th International Cosmic Ray Conference (ICRC2019) - NU - Neutrino
Constraining anomalous EeV ANITA detections with PeV neutrinos
I. Safa,* A. Pizzuto, C. Arguelles, F. Halzen, R. Hussain, A. Kheirandish, J. Vandenbroucke
*corresponding author
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Pre-published on: 2019 July 22
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Tau neutrinos are unique messengers, especially at extreme energies. When they undergo a charged-current interaction, the short lifetime of the tau gives rise to regenerated neutrinos at relatively high energies. ANITA recently reported two EeV showers which, at first glance, could be interpreted as emerging tau neutrinos. Their emergence angle was shown to be in tension with the expected angular distribution from isotropic astrophysical neutrinos. However, localized emission from a point source in the event's direction can evade diffuse bounds. In this work, we present an updated and precise calculation of the tau-regeneration effect using a newly developed Monte Carlo package, TauRunner. We describe the algorithm and the software\’s capabilities, and apply it to the anomalous ANITA detections. We show that any flux from the direction of the ANITA events should be accompanied by secondary tau-neutrinos detectable at IceCube. We derive the maximum allowed secondary flux at IceCube and use it to infer the maximum number of events ANITA would detect. We find that ANITA should see not more than $10^{-6}$ events, requiring a significant over-fluctuation to account for the anomalous event in 2014.
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