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Abstract
Cosmic neutrinos are expected to include a significant flux of tau neutrinos due to flavor mixing over astronomical length scales. However, the tau-neutrino content of astrophysical neutrinos is poorly constrained and a significant flux of cosmogenic tau neutrinos awaits discovery. Earth-skimming tau neutrinos undergo charged-current interactions that result in a tau lepton exiting the Earth. The tau lepton decay generates anextensive air shower and geomagnetic radio emission. To target the tau neutrinos, we present a new tau neutrino detector concept that uses phased antenna arrays placed on high elevation mountains. Simulation studies indicate that a modest array size and small number of stations can achieve competitive sensitivity, provided the receivers are at highs enough elevation.
Highlights
Tau neutrinos are expected to be a significant component of the ultra-high-energy (UHE, E > 1017 eV) cosmic neutrino flux
Earth-skimming tau neutrinos can generate tau leptons emerging from the Earth, after the tau neutrinos interact via a charged current interaction
A radio detector pointed at the horizon can search for the impulsive band-limited radio emission generated when the tau lepton decays
Summary
Tau neutrinos are expected to be a significant component of the ultra-high-energy (UHE, E > 1017 eV) cosmic neutrino flux. A radio detector pointed at the horizon can search for the impulsive band-limited radio emission generated when the tau lepton decays. We consider the sensitivity of a new detector concept called the Beamforming Elevated Array for Cosmic Neutrinos (BEACON). The goal of BEACON is to search for tau neutrinos on top of high-elevation mountains with phased arrays.
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