Wino Dark Matter in light of the AMS-02 2015 Data

Abstract

The AMS-02 collaboration has recently reported the antiproton to proton ratio with improved accuracy. In view of uncertainties of the production and the propagation of the cosmic rays, the observed ratio is still consistent with the secondary astrophysical antiproton to proton ratio. However, it is nonetheless enticing to examine whether the observed spectrum can be explained by a strongly motivated dark matter, the wino dark matter. As we will show, we find that the antiproton flux from the wino annihilation can explain the observed spectrum well for its mass range 2.5-3 TeV. The fit to data becomes particularly well compared to the case without the annihilation for the thermal wino dark matter case with a mass about 3 TeV. The ratio is predicted to be quickly decreased at the energy several hundreds of GeV, if this possibility is true, and it will be confirmed or ruled out in near future when the AMS-02 experiment accumulates enough data at this higher energy region.

6 pages, 2 figures, version accepted for publication in PRD (Rapid Communication)

References in corpus (22)

• PYTHIA 6.4 Physics and Manual
• Leptogenesis
• Cosmology and Astrophysics of Minimal Dark Matter
• Non-perturbative Effect on Thermal Relic Abundance of Dark Matter
• Weak Corrections are Relevant for Dark Matter Indirect Detection
• On possible interpretations of the high energy electron-positron spectrum measured by the Fermi Large Area Telescope
• Search for photon line-like signatures from Dark Matter annihilations with H.E.S.S
• Neutralino Dark Matter at 14 and 100 TeV
• Minimal Dark Matter predictions for galactic positrons, anti-protons, photons
• Possible Signals of Wino LSP at the Large Hadron Collider
• Galactic electrons and positrons at the Earth:new estimate of the primary and secondary fluxes
• Moduli stabilization, F-term uplifting and soft supersymmetry breaking terms
• A Comprehensive Search for Dark Matter Annihilation in Dwarf Galaxies
• Search for dark matter annihilation signatures in H.E.S.S. observations of Dwarf Spheroidal Galaxies
• Search for disappearing tracks in proton-proton collisions at sqrt(s) = 8 TeV
• R-violating Decay of Wino Dark Matter and electron/positron Excesses in the PAMELA/Fermi Experiments
• Wino Dark Matter and Future dSph Observations
• Supersymmetry from Typicality
• Universality in Pure Gravity Mediation with Vector Multiplets
• Anomaly Mediated Gaugino Mass and Path-Integral Measure
• Small steps towards Grand Unification and the electron/positron excesses in cosmic-ray experiments
• Coupling Unification and Dark Matter in a Standard Model Extension with Adjoint Majorana Fermions

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• Gamma-ray line from electroweakly interacting non-abelian spin-1 dark matter