Signals of dark matter in a supersymmetric two dark matter model

TL;DR

This paper explores a supersymmetric model with two dark matter candidates, analyzing how their interactions and decay processes could produce observable signals that differ from standard models, impacting detection strategies.

Contribution

It introduces a supersymmetric radiative neutrino mass model with two dark matter candidates, including a metastable particle whose decay affects cosmic ray signals and detection.

Findings

Decays of the second dark matter candidate can produce cosmic ray deviations.

Direct detection signatures differ from the MSSM due to mixed relic abundance.

The model predicts unique signals that can be tested in future experiments.

Abstract

Supersymmetric radiative neutrino mass models have often two dark matter candidates. One is the usual lightest neutralino with odd R parity and the other is a new neutral particle whose stability is guaranteed by a discrete symmetry that forbids tree-level neutrino Yukawa couplings. If their relic abundance is comparable, dark matter phenomenology can be largely different from the minimal supersymmetric standard model (MSSM). We study this in a supersymmetric radiative neutrino mass model with the conserved R parity and a $Z_2$ symmetry weakly broken by the anomaly effect. The second dark matter with odd parity of this new $Z_2$ is metastable and decays to the neutralino dark matter. Charged particles and photons associated to this decay can cause the deviation from the expected background of the cosmic rays. Direct search of the neutralino dark matter is also expected to show different features from the MSSM since the relic abundance is not composed of the neutralino dark matter only. We discuss the nature of dark matter in this model by analyzing these signals quantitatively.