Constraints on WIMP Dark Matter from the High Energy PAMELA $\bar{p}/p$ data

Understand

A new calculation of the $\bar{p}/p$ ratio in cosmic rays is compared to the recent PAMELA data.

• The good match up to 100 GeV allows to set constraints on exotic contributions from thermal WIMP dark matter candidates.
• We derive stringent limits on possible enhancements of the WIMP \pbar flux: a $m_{\rm WIMP}$=100 GeV (1 TeV) signal cannot be increased by more than a factor 6 (40) without overrunning PAMELA data.
• Annihilation through the $W^+W^-$ channel is also inspected and cross-checked with $e^+/(e^-+e^+)$ data.