Viability of detection by AMS of sudden features due to dark matter annihilation to positrons and electrons

Understand

The Fermi experiment has measured the cosmic ray electron+positron spectrum and positron fraction [$\Phi_{e^+}/(\Phi_{e^+ + e^-})]$, and PAMELA has measured the positron fraction with better precision.

• While the majority of cosmic ray electrons and positrons are of astrophysical origin, there may also be a contribution from dark matter annihilation in the galactic halo.
• The upcoming results of the AMS experiment will show measurements of these quantities with far greater precision.
• One dark matter annihilation scenario is where two dark matter particles annihilate directly to $e^+$ and $e^-$ final states.