Decaying Asymmetric Dark Matter Relaxes the AMS-Fermi Tension

Abstract

The first result of AMS-02 confirms the positron fraction excess observed by PAMELA, but the spectrum is somewhat softer than that of PAMELA. In the dark matter (DM) interpretation it brings a tension between AMS-02 and Fermi-LAT, which reported an excess of the electron plus positron flux. In this work we point out that the asymmetric cosmic ray from asymmetric dark matter (ADM) decay relaxes the tension. It is found that in the case of two-body decay a bosonic ADM around 2.4 TeV and decaying into ${\mu }^{-}{\tau }^{+}$ can significantly improve the fits. Based on the $R-$parity-violating supersymmetry with operators $LL{E}^c$, we propose a minimal model to realize that ADM. The model introduces only a pair of singlets $(X,\bar{X})$ with a tiny coupling $L{H}_{u}X$, which makes the ADM share the lepton asymmetry and decay into ${\mu }^{-}{\tau }^{+}$ along the operator $LL{E}^c$.

The JCAP version; References and comments added; Improved fitting using MCMC

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• Indirect and direct signatures of Higgs portal decaying vector dark matter for positron excess in cosmic rays
• Revisiting Multi-Component Dark Matter with New AMS-02 Data
• Asymmetric Dark Matter Bound State
• AMS-02 Positron Excess and Indirect Detection of Three-body Decaying Dark Matter
• Systematic study of the uncertainties in fitting the cosmic positron data by AMS-02
• A general study of decaying scalar dark matter: existing limits and projected radio signals at the SKA
• Indirect Detection Signatures for the Origin of Asymmetric Dark Matter
• Continuous Flavor Symmetries and the Stability of Asymmetric Dark Matter
• The NIKA2 Sunyaev-Zeldovich Large Program
• Decaying WIMP dark matter for AMS-02 cosmic positron excess
• The Atacama Cosmology Telescope: Extragalactic Point Sources in the Southern Surveys at 150, 220 and 280 GHz observed between 2008-2010