A comprehensive analysis of anomalous ANITA events disfavors a diffuse tau-neutrino flux origin. (arXiv:1811.07261v1 [astro-ph.HE])

A comprehensive analysis of anomalous ANITA events disfavors a diffuse tau-neutrino flux origin. (arXiv:1811.07261v1 [astro-ph.HE])
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Recently, the ANITA collaboration reported on two upward-going extensive air
shower events consistent with a primary particle that emerges from the surface
of the ice. These events may be of $nu_tau$ origin, in which the neutrino
interacts within the Earth to produce a $tau$ lepton that emerges from the
Earth, decays in the atmosphere, and initiates an extensive air shower. In this
paper we estimate an upper bound on the ANITA acceptance to a diffuse
$nu_tau$ flux detected via $tau$-lepton-induced air showers within the
bounds of Standard Model (SM) uncertainties. By comparing this estimate with
the acceptance of Pierre Auger Observatory and IceCube and assuming SM
interactions, we conclude that a $nu_tau$ origin of these events would imply
a neutrino flux at least two orders of magnitude above current bounds.

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