Distinctive signals of boosted dark matter from its semi-annihilation

TL;DR

This paper identifies unique signals from semi-annihilation of dark matter, producing distinguishable high-energy neutrino and dark matter fluxes that could be detected by future neutrino observatories.

Contribution

It demonstrates that semi-annihilation $ oar{} u$ yields distinctive signals with double peaks, offering a new way to detect boosted dark matter.

Findings

Double-peaked energy spectrum near dark matter mass.

Detection prospects with future neutrino detectors.

Distinctive signals differentiate from other dark matter processes.

Abstract

Dark matter can be boosted by various mechanisms, which may produce characteristic signals that are different from those of canonical dark matter. We show that the semi-annihilation $\chi\chi\to\bar{\chi}\nu$ produces signals that are distinctive from those of other semi-annihilation and standard dark matter annihilation processes. Because the boosted dark matter produced by the semi-annihilation process is regarded as a high-energy neutrino, the total flux of the dark matter and the accompanying neutrino produce double peaks in the energy close to the dark matter mass. We show that it will be possible to detect both of the particles produced at the Sun using future large volume neutrino detectors such as those of the Deep Underground Neutrino Experiment and Hyper-Kamiokande.