Using a line-of-sight transport formalism, the paper finds a 3.1 sigma tension between the KM3NeT ultra-high-energy event and IceCube non-observation under a diffuse power-law flux, with stronger tension for steady point sources.
High-energy neutrino attenuation in the Earth and its associated uncertainties
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abstract
We describe nuFATE Neutrino Fast Attenuation Through Earth, a very rapid method of accurately computing the attenuation of high-energy neutrinos during their passage through Earth to detectors such as IceCube, ANTARES or KM3Net, including production of secondary neutrinos from $\tau^\pm$ lepton decay. We then use this method to quantify the error on attenuation due to uncertainties in the isotropic neutrino spectrum, the composition of the Earth, and the parton distribution functions. We show that these can be as large as 20%, which can significantly impact reconstructed astrophysical neutrino parameters, as well as searches for new physics. An implementation of this algorithm is provided as a public code.
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Exploring ultra-high energy neutrino experiments through the lens of the transport equation
Using a line-of-sight transport formalism, the paper finds a 3.1 sigma tension between the KM3NeT ultra-high-energy event and IceCube non-observation under a diffuse power-law flux, with stronger tension for steady point sources.