Ultra-High-Energy Tau Neutrino Cross Sections with GRAND and POEMMA

Abstract

Next generation neutrino experiments will push the limits in our understanding of astroparticle physics in the neutrino sector to energies orders of magnitude higher than the current state-of-the-art high-energy neutrino experiment, IceCube. These experiments will use neutrinos to tell us about the most extreme environments in the universe, while simultaneously leveraging these extreme environments as probes of neutrino properties at the highest energies accessible in the foreseeable future: $E\sim 10^9$ GeV. At these energies neutrinos are readily absorbed in the Earth. Assuming an isotropic distribution, by looking at how the flux varies as a function of angle through the Earth, we show that it is possible to extract the ${\nu }_{\tau }$-$N$ cross section with precision at the $\sim 20\%$ level ($1\sigma$ assuming Wilks' theorem) given $N_{\mathrm{events}}\sim 100$ events.

7 pages, 5 figures, comments welcome; v2: minor changes, matches published version

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• Design and Initial Performance of the Prototype for the BEACON Instrument for Detection of Ultrahigh Energy Particles
• Detector Requirements for Model-Independent Measurements of Ultrahigh Energy Neutrino Cross Sections
• Probing Heavy Sterile Neutrinos at Ultrahigh Energy Neutrino Telescopes via the Dipole Portal
• High-energy neutrino deep inelastic scattering cross sections
• Probing Quantum Gravity with Elastic Interactions of Ultra-High-Energy Neutrinos
• Double and multiple bangs at tau neutrino telescopes: A novel probe of sphalerons with cosmogenic neutrinos
• Many-Body Simulations of the Fast Flavor Instability
• A $\nu$ window onto leptoquarks?
• IceCube and the origin of ANITA-IV events
• Neutrino Interaction Physics in Neutrino Telescopes
• Cosmogenic neutrinos as probes of new physics
• Ultra-high-energy neutrino scattering in an anomalous U(1) effective field theory
• Using Secondary Tau Neutrinos to Probe Heavy Dark Matter Decays in Earth