ATIC/PAMELA anomaly from fermionic decaying Dark Matter

TL;DR

This paper proposes a two Higgs doublet model where fermionic dark matter decays explain electron and positron excesses observed in ATIC and PAMELA, without fine-tuning, and also includes a stable dark matter candidate.

Contribution

It introduces a minimal two Higgs doublet model that accounts for cosmic ray anomalies via three-body dark matter decays, avoiding fine-tuning of parameters.

Findings

Dark matter decay explains electron/positron excesses

Model accommodates a stable dark matter candidate

Decaying dark matter mass and lifetime are flexible

Abstract

We demonstrate that an economical two Higgs doublet model can explain the electron and positron excesses in the recent ATIC and PAMELA experiments by the three body decays of the dark matter (DM) fermions without requiring the fine turning of the couplings and degeneracy of masses. We also show that the mass and lifetime of the decaying DM particle may not be fixed to be around 1 TeV and 10^{26} sec, respectively. Moreover, we note that this model includes a stable dark matter candidate as well.