The Payload for Ultrahigh Energy Observations (PUEO): a white paper

Abstract

The Payload for Ultrahigh Energy Observations (PUEO) long-duration balloon\nexperiment is designed to have world-leading sensitivity to ultrahigh-energy\nneutrinos at energies above 1 EeV. Probing this energy region is essential for\nunderstanding the extreme-energy universe at all distance scales. PUEO\nleverages experience from and supersedes the successful Antarctic Impulsive\nTransient Antenna (ANITA) program, with an improved design that drastically\nimproves sensitivity by more than an order of magnitude at energies below 30\nEeV. PUEO will either make the first significant detection of or set the best\nlimits on ultrahigh-energy neutrino fluxes.\n