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A new calculation of the $\bar{p}/p$ ratio in cosmic rays is compared to therecent PAMELA data. The good match up to 100 GeV allows to set constraints onexotic contributions from thermal WIMP dark matter candidates. We derivestringent limits on possible enhancements of the WIMP \pbar flux: a $m_{\rmWIMP}$=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 isalso inspected and cross-checked with $e^+/(e^-+e^+)$ data. This scenario isstrongly disfavored as it fails to simultaneously reproduce positron andantiproton measurements.

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