Development of dark disk model of positron anomaly origin

Abstract

Dark disk model could be a remedy for dark matter (DM) explanation of positron anomaly (PA) in cosmic rays (CR). The main difficulty in PA explanation relates to cosmic gamma-radiation which is inevitably produced in DM annihilation or decay leading to tension with respective observation data. Introduction of "active" (producing CR) DM component concentrating in galactic disk alleviates this tension. Earlier we considered two-lepton modes, with branching ratios being chosen to fit in the best way all the observation data. Here we considered, in framework of the same dark disk model, two cases: two-body final state annihilation and four-body one, and in each case a quark mode is added to the leptonic ones. It is shown that 4-body mode case is a little better than 2-body one from viewpoint of quality of observation data description at the fixed all other parameters (of CR propagation, background, disk height). The values of DM particle mass around 350 GeV and 500 GeV are more favourable for 2- and 4-body modes respectively. Higher values would improve description of data on positrons only but accounting for data on gamma-radiation prevents it because of unwanted more abundant high-energy gamma production. Inclusion of the quark modes improves a little fitting data in both 4- and 2-body mode cases, contrary to naive expectations. In fact, quark mode has a bigger gammas yield than that of most gamma-productive leptonic mode~--- tau, but they are softer due to bigger final state hadron multiplicity.

arXiv comment13 pages, 16 figures

References in corpus (23)

• Planck 2015 results. XIII. Cosmological parameters
• A Brief Introduction to PYTHIA 8.1
• Observation of an anomalous positron abundance in the cosmic radiation
• The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV
• Extended gamma-ray sources around pulsars constrain the origin of the positron flux at Earth
• Dark Matter Constraints from Observations of 25 Milky Way Satellite Galaxies with the Fermi Large Area Telescope
• Thin, thick and dark discs in LCDM
• Resolving the Extragalactic $\gamma$-ray Background above 50 GeV with Fermi-LAT
• Dissecting cosmic-ray electron-positron data with Occam's Razor: the role of known Pulsars
• Search for gamma-ray emission from the Coma Cluster with six years of Fermi-LAT data
• Decaying Dark Matter in Light of the PAMELA and Fermi LAT Data
• Signatures of a two million year old supernova in the spectra of cosmic ray protons, antiprotons and positrons
• Is the PAMELA anomaly caused by the supernova explosions near the Earth?
• Bayesian analysis of spatial-dependent cosmic-ray propagation: astrophysical background of antiprotons and positrons
• The Dark Disk of the Milky Way
• Cosmic Ray Anisotropy as Signature for the Transition from Galactic to Extragalactic Cosmic Rays
• Constraining dark matter late-time energy injection: decays and p-wave annihilations
• Cosmic ray propagation and dark matter in light of the latest AMS-02 data
• Dissipative Dark Matter and the Andromeda Plane of Satellites
• Fermi-LAT kills dark matter interpretations of AMS-02 data. Or not?
• A dark matter model that reconciles tensions between the cosmic-ray $e^{\pm }$ excess and the gamma-ray and CMB constraints
• Late decaying 2-component dark matter scenario as an explanation of the AMS-02 positron excess
• Decaying Fermionic Dark Matter Search with CALET

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