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

2009

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

Kadastik, Mario, Raidal, Martti, Strumia, Alessandro

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We show that the jet structure of DM annihilation or decay products enhances the anti-deuterium 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_p, we get a constant rather than 1/M^2 suppressed anti-deuterium production rate.
Therefore, a detectable anti-deuterium signal is compatible with the lack of an excess in the anti-proton PAMELA flux.
Most importantly, cosmic anti-deuterium searches become sensitive to the annihilations or decays of heavy DM, suggesting to extend the experimental anti-deuterium searches above the O(1) GeV scale.

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T. Sjostrand, S. Mrenna, P. Skands, Comput. Phys. Com. 178, 852 (2008) [arXiv:0710.3820]
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