Cosmic-ray positrons strongly constrain leptophilic dark matter

  title={Cosmic-ray positrons strongly constrain leptophilic dark matter},
  author={Isabelle John and Tim Linden},
  journal={Journal of Cosmology and Astroparticle Physics},
Cosmic-ray positrons have long been considered a powerful probe of dark matter annihilation. In particular, myriad studies of the unexpected rise in the positron fraction have debated its dark matter or pulsar origins. In this paper, we instead examine the potential for extremely precise positron measurements by AMS-02 to probe hard leptophilic dark matter candidates that do not have spectral features similar to the bulk of the observed positron excess. Utilizing a detailed cosmic-ray… 

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We discuss model-independent collider constraints on the effective couplings of leptophilic dark matter (LDM), considering its production at a future electron-positron linear collider, with both

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We also consider a range of diffusion parameters consistent with current cosmic ray data. We find that a significant upturn in the positron fraction above 10 GeV is compatible with a wide range of

Galactic propagation of positrons from particle dark-matter annihilation

We have made a calculation of the propagation of positrons from dark-matter particle annihilation in the Galactic halo for different models of the dark matter halo distribution using our 3D code. We

Dark Matter and Pulsar Origins of the Rising Cosmic Ray Positron Fraction in Light of New Data From AMS

The rise of the cosmic ray positron fraction with energy, as first observed with high confidence by PAMELA, implies that a large flux of high energy positrons has been recently (or is being

Positron line radiation as a signature of particle dark matter in the halo.

  • TurnerWilczek
  • Physics
    Physical review. D, Particles and fields
  • 1990
A new signature for dark matter annihilation in the halo: high energy positron line radiation, which may be an important signature for massive neutralino annihilations, especially near or above the threshold of the W+W- and ZoZo annihilation channels.


Recent observations by PAMELA, Fermi-LAT, and AMS-02 have conclusively indicated a rise in the cosmic-ray positron fraction above 10 GeV, a feature which is impossible to mimic under the paradigm of

New limits on dark matter annihilation from Alpha Magnetic Spectrometer cosmic ray positron data.

The Alpha Magnetic Spectrometer experiment onboard the International Space Station has recently provided cosmic ray electron and positron data with unprecedented precision in the range from 0.5 to

Pulsars as the sources of high energy cosmic ray positrons

Recent results from the PAMELA satellite indicate the presence of a large flux of positrons (relative to electrons) in the cosmic ray spectrum between approximately 10 and 100 GeV. As annihilating

Gamma Ray Spectra from Dark Matter Annihilation and Decay

In this paper, we study gamma ray spectra for various scenarios of dark matter annihilation and decay. We focus on processes which generate only high-energy photons or leptons and photons, but no

HAWC Observations Strongly Favor Pulsar Interpretations of the Cosmic-Ray Positron Excess

Recent measurements of the Geminga and B0656+14 pulsars by the gamma-ray telescope HAWC (along with earlier measurements by Milagro) indicate that these objects generate significant fluxes of very

Extended gamma-ray sources around pulsars constrain the origin of the positron flux at Earth

Extended gamma-ray emission around nearby pulsars indicates that positrons arriving at Earth must have an exotic origin, and demonstrates that these pulsars are indeed local sources of accelerated leptons, but the measured tera–electron volt emission profile constrains the diffusion of particles away from these sources to be much slower than previously assumed.