Galactic diffusion and the antiprotron signal of supersymmetric dark matter

Abstract

The leaky box model is now ruled out by measurements of a cosmic ray gradient throughout the galactic disk. It needs to be replaced by a more refined treatment which takes into account the diffusion of cosmic rays in the magnetic fields of the Galaxy. We have estimated the flux of antiprotons on the Earth in the framework of a two-zone diffusion model. Those species are created by the spallation reactions of high-energy nuclei with the interstellar gas. Another potential source of antiprotons is the annihilation of supersymmetric particles in the dark halo that surrounds our Galaxy. In this letter, we investigate both processes. Special emphasis is given to the antiproton signature of supersymmetric dark matter. The corresponding signal exceeds the conventional spallation flux below 300 MeV, a domain that will be thoroughly explored by the Antimatter Spectrometer experiment. The propagation of the antiprotons produced in the remote regions of the halo back to the Earth plays a crucial role. Depending on the energy, the leaky box estimates are wrong by a factor varying from 0.5 up to 3.

14 pages, LaTeX, 4 postscript figures appended as uuencoded g-zipped tar file

Cited by in corpus (34)

• DarkSUSY: Computing Supersymmetric Dark Matter Properties Numerically
• PPPC 4 DM ID: A Poor Particle Physicist Cookbook for Dark Matter Indirect Detection
• Secondary antiprotons and propagation of cosmic rays in the Galaxy and heliosphere
• Positron Propagation and Fluxes from Neutralino Annihilation in the Halo
• Antiprotons from spallations of cosmic rays on interstellar matter
• Antideuterons as a Signature of Supersymmetric Dark Matter
• Minimal Dark Matter: model and results
• Minimal Dark Matter predictions for galactic positrons, anti-protons, photons
• Prospects for Indirect Detection of Neutralino Dark Matter
• Clumpy Neutralino Dark Matter
• Cosmic antiprotons as a probe for supersymmetric dark matter?
• The cosmic ray positron excess and neutralino dark matter
• Indirect Detection of Dark Matter in km-size Neutrino Telescopes
• Which fraction of the measured cosmic-ray antiprotons might be due to neutralino annihilation in the galactic halo?
• Positrons and antiprotons from inert doublet model dark matter
• Exploring the BWCA (Bino-Wino Co-Annihilation) Scenario for Neutralino Dark Matter
• New calculation of antiproton production by cosmic ray protons and nuclei
• Mixed Wino Dark Matter: Consequences for Direct, Indirect and Collider Detection
• Positrons from particle dark-matter annihilation in the Galactic halo: propagation Green's functions
• Indirect, Direct and Collider Detection of Neutralino Dark Matter
• Neutralinos and the Origin of Radio Halos in Clusters of Galaxies
• Possible Indications of a Clumpy Dark Matter Halo
• The Semi-Hooperon: Gamma-ray and anti-proton excesses in the Galactic Center
• Neutrinos from Dark Matter annihilations at the Galactic Centre
• Mixed Higgsino Dark Matter from a Reduced SU(3) Gaugino Mass: Consequences for Dark Matter and Collider Searches
• Mixed Higgsino Dark Matter from a Large SU(2) Gaugino Mass
• Supersymmetry and Cosmology
• Dipole-interacting Fermionic Dark Matter in positron, antiproton, and gamma-ray channels
• Limits on R-parity violation from cosmic ray antiprotons
• Probing Neutralino Resonance Annihilation via Indirect Detection of Dark Matter
• A New Limit on the Antiproton Lifetime
• Secondary antiproton flux induced by cosmic ray interactions with the atmosphere
• Perspectives for Detection of a Higgsino-like Relic Neutralino
• Dark matter in the universe