The ANITA Anomalous Events

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nsaspook

Joined Aug 27, 2009
13,081
https://arxiv.org/pdf/1809.09615.pdf
The ANITA collaboration have reported observation of two anomalous events that appear to be εcr ≈ 0.6 EeV cosmic ray showers emerging from the Earth with exit angles of 27◦ and 35◦ , respectively. While EeV-scale upgoing showers have been anticipated as a result of astrophysical tau neutrinos converting to tau leptons during Earth passage, the observed exit angles are much steeper than expected in Standard Model (SM) scenarios. Indeed, under conservative extrapolations of the SM interactions, there is no particle that can propagate through the Earth with probability p > 10−6 at these energies and exit angles. We explore here whether “beyond the Standard Model” (BSM) particles are required to explain the ANITA events, if correctly interpreted, and conclude that they are. Seeking confirmation or refutation of the physical phenomenon of sub-EeV Earth-emergent cosmic rays in data from other facilities, we find support for the reality of the ANITA events, and three candidate analog events, among the Extremely High Energy Northern Track neutrinos of the IceCube Neutrino Observatory. Properties of the implied BSM particle are anticipated, at least in part, by those predicted for the “stau” slepton (˜τR) in some supersymmetric models of the fundamental interactions, wherein the stau manifests as the next-to-lowest mass supersymmetric partner particle.
 

killivolt

Joined Jan 10, 2010
835
https://icecube.wisc.edu/news/view/546

South Pole Neutrino Observatory said:
The study, published online on November 22 by the journal Nature, is based on one year of data from about 10,800 neutrino-related interactions, stemming from a natural supply of very energetic neutrinos from space that go through a thick and dense absorber: the Earth. The energy of the neutrinos was critical to the study, as higher energy neutrinos are more likely to interact with matter and be absorbed by the Earth.

kv
 
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