2003/06/30 by Fiorenza Donato, F. Donato, N. Fornengo +4
Physics and Astronomy · #Annihilation #Antiproton #Astrophysics #Cosmic ray #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Galaxy #Halo #Neutralino #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Proton #Supergravity #Supersymmetry #astro-ph #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.69.063501
published as Phys.Rev.D69:063501,2004 · 23 pages, 2 tables and 19 figures, typeset with ReVTeX4. The paper may also be found at http://www.to.infn.it/~fornengo/papers/pbar03.ps.gz or through http://www.to.infn.it/astropart/index.html A subsection added. Final version to appear in PRD
arxiv created 2004/01/12 · openalex publication_date 2004/03/02 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/08
We calculate the antiproton flux due to relic neutralino annihilations, in a two-dimensional diffusion model compatible with stable and radioactive cosmic ray nuclei. We find that the uncertainty in the primary flux induced by the propagation parameters alone is about two orders of magnitude at low energies, and it is mainly determined by the lack of knowledge of the thickness of the diffusive halo. On the contrary, different dark matter density profiles do not significantly alter the flux: a Novarro-Frenk-White distribution produces fluxes which are at most 20% higher than an isothermal sphere. The most conservative choice for propagation parameters and dark matter distribution normalization, together with current data on cosmic antiprotons, cannot lead to any definitive constraint on the supersymmetric parameter space, either in a low-energy effective minimal supersymmetric standard model, or in a minimal supergravity scheme. However, if the best choice for propagation parameters---corresponding to a diffusive halo of L=4kpc---is adopted, some supersymmetric configurations with the neutralino mass m_\ensuremathχ\ensuremath\lesssim100GeV should be considered as excluded. An enhancement flux factor---due for instance to a clumpy dark halo or a higher local dark matter density---would imply a more severe cut on the supersymmetric parameters.