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Abstract: The spectrum of gamma rays from the galactic center (Fermi+HESS) as well as the spectrum of cosmic ray electrons (Fermi+HESS) both exhibit a cutoff at TeV energies. Such a cutoff can be naturally explained by the spectrum of annihilating dark matter in both cases. We update the previous constraints in the plane thermal cross-section vs. dark matter mass. We also study the best fits to the data in the parameter space defined by the branching ratio to a particular annihilation channel and the mass of dark matter particle. This is more robust than the boost factor to the uncertainties introduced by dark matter distribution and the propagation of charged particles.
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