New Constraints from PAMELA anti-proton data on Annihilating and Decaying Dark Matter

Understand

Recently the PAMELA experiment has released its updated anti-proton flux and anti-proton to proton flux ratio data up to energies of ~200GeV.

• With no clear excess of cosmic ray anti-protons at high energies, one can extend constraints on the production of anti-protons from dark matter.
• In this letter, we consider both the cases of dark matter annihilating and decaying into standard model particles that produce significant numbers of anti-protons.
• We provide two sets of constraints on the annihilation cross-sections/decay lifetimes.