Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-05-05
Nucl.Phys.B831:178-203,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
30 pages, 13 figures. Final and updated version
Scientific paper
10.1016/j.nuclphysb.2010.01.012
The cosmic-ray excess observed by PAMELA in the positron fraction and by FERMI and HESS in the electron + positron flux can be interpreted in terms of DM annihilations or decays into leptonic final states. Final states into tau's or 4mu give the best fit to the excess. However, in the annihilation scenario, they are incompatible with photon and neutrino constraints, unless DM has a quasi-constant density profile. Final states involving electrons are less constrained but poorly fit the excess, unless hidden sector radiation makes their energy spectrum smoother, allowing a fit to all the data with a combination of leptonic modes. In general, DM lighter than about a TeV cannot fit the excesses, so PAMELA should find a greater positron fraction at higher energies. The DM interpretation can be tested by FERMI gamma observations above 10 GeV: if the electronic excess is everywhere in the DM halo, inverse Compton scattering on ambient light produces a well-predicted gamma excess that FERMI should soon detect.
Meade Patrick
Papucci Michele
Strumia Alessandro
Volansky Tomer
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