Speaker
Description
The ANITA balloon experiment has observed two EeV-level, upgoing cascade events, which cannot be explained by the Standard Model neutrino interactions that make the Earth opaque to EeV neutrinos. In this paper, we analyze a long-lived bino interpretation in leptonic R-parity violating supersymmetry. In particular, a TeV-scale bino can be resonantly produced through the interaction of the EeV neutrino with electrons inside Earth and propagate through Earth matter before decaying back to leptons and neutrino near ANITA. For appropriate decay length of the bino, this also explains why IceCube has not seen these events in spite of a higher exposure time. The corresponding RPV coupling required to fit the ANITA data is consistent with the current laboratory bounds. Finally, we find that an isotropic GZK neutrino flux is too small to account for the ANITA events and a non-isotropic EeV neutrino flux, presumably coming from point sources, such as GRB or blazars, is needed.
