From PAMELA to CDMS and back

2009/12/31 by Qing-Hong Cao, Ian Low, Gabe Shaughnessy
Physics and Astronomy · #Annihilation #Astrophysics #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Electron #Flux (metallurgy) #Form factor (electronics) #Hadron #Halo #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Physics #Positron #Proton #astro-ph.CO #hep-ph

paper · pdf · doi:10.1016/j.physletb.2010.06.023

published as Phys.Lett.B691:73-76,2010 · 4 pages, 4 figures. Version to appear in Phys. Lett. B

openalex publication_date 2010/06/20 · arxiv created 2010/06/23 · arxiv updated 2014/11/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We take the recent result from the CDMS collaboration as a hint that the dark matter has an elastic scattering cross section with the nucleon in the vicinity of 10^-7 pb. By crossing symmetry such a cross section implies annihilation of dark matter into hadrons inside the halo, resulting in an anti-proton flux that could be constrained by data from the PAMELA collaboration if one includes a large boost factor necessary to explain the PAMELA excess in the positron fraction. As an illustration, we present a model-independent analysis for a fermionic dark matter and study the upper bound on the boost factor using the PAMELA anti-proton flux.

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