# Detection of Ultra-High Energy neutrinos skimming the Earth due to decay of superheavy dark matter at JEM-EUSO

## TL;DR

This paper explores the potential for JEM-EUSO to detect ultra-high energy neutrinos from superheavy dark matter decay, providing estimates of detection rates and conditions for confirming dark matter existence.

## Contribution

It proposes a method to identify neutrinos from superheavy dark matter decay at JEM-EUSO and estimates detection rates over five years.

## Key findings

- Detection of up to 10^4 neutrino events at 30 EeV is possible within 5 years.
- Neutrino detection is feasible if dark matter lifetime is between 10^27 and 10^31 seconds.
- Astrophysical neutrino contamination can be negligible at high energy thresholds.

## Abstract

The possibility of detecting Ultra-high energy (UHE from now on) neutrinos due to superheavy dark matter are considered by the neutrinos interaction with the nuclei in the air in the present paper. To reject other standard model particles, UHE neutrinos, from superheavy dark matter and astrophysical sources, skimming the Earth are detected at JEM-EUSO. Then the numbers of UHE neutrinos detected by JEM-EUSO are evaluated at different energies (1 EeV < E < 1 ZeV) in 5 years. If the energy thresholds are taken to be 100 EeV, the astrophysical neutrino contamination could be negligible in this detection. It is possible that UHE neutrinos from the decay of superheavy dark matter are detected at JEM-EUSO when $O(10^{27})s < \tau_{\phi}< O(10^{31})s$. For example, O($10^4$) UHE neutrino events could be detected by JEM-EUSO at 30 EeV in 5 years when $\tau_{\phi}=O(10^{27})$s. If so, it may be confirmed that there may exist superheavy dark matter in the Universe.