Enhanced anti-deuteron Dark Matter signal and the implications of PAMELA

We show that the jet structure of DM annihilation or decay products enhances the d¯ production rate by orders of magnitude compared to the previous computations done assuming a spherically symmetric coalescence model. In particular, in the limit of heavy DM, M≫m, we get a constant rather than 1/M² suppressed d¯ production rate. Therefore, a detectable d¯ signal is compatible with the lack of an excess in the p¯ PAMELA flux. Most importantly, cosmic d¯ searches become sensitive to the annihilations or decays of heavy DM, suggesting to extend the experimental d¯ searches above the O(1) GeV scale.