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Title: Decaying asymmetric dark matter relaxes the AMS-Fermi tension

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 μ{sup −}τ{sup +} can significantly improve the fits. Based on the R−parity-violating supersymmetry with operators LLE{sup c}, we propose a minimal model to realize that ADM. The model introduces only a pair of singlets (X, X-bar ) with a tiny coupling LH{sub u}X, which makes the ADM share the lepton asymmetry and decay into μ{sup −}τ{sup +} along the operator LLE{sup c}.
Authors:
 [1] ;  [2]
  1. Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China)
  2. Center for High-Energy Physics, Peking University, Beijing, 100871 (China)
Publication Date:
OSTI Identifier:
22282661
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2013; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; ASYMMETRY; COSMIC RADIATION; COSMOLOGY; COUPLING; ELECTRONS; NONLUMINOUS MATTER; P INVARIANCE; PARTICLE DECAY; POSITRONS; SUPERSYMMETRY; TEV RANGE; TWO-BODY PROBLEM