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arXiv · 1207.3971

Loop-induced dark matter direct detection signals from gamma-ray lines

Mads T. Frandsen·Ulrich Haisch·Felix Kahlhoefer·Philipp Mertsch·Kai Schmidt-Hoberg
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Abstract

Improved limits as well as tentative claims for dark matter annihilation into gamma-ray lines have been presented recently. We study the direct detection cross section induced from dark matter annihilation into two photons in a model-independent fashion, assuming no additional couplings between dark matter and nuclei. We find a striking non-standard recoil spectrum due to different destructively interfering contributions to the dark matter nucleus scattering cross section. While in the case of s-wave annihilation the current sensitivity of direct detection experiments is insufficient to compete with indirect detection searches, for p-wave annihilation the constraints from direct searches are comparable. This will allow to test dark matter scenarios with p-wave annihilation that predict a large di-photon annihilation cross section in the next generation of experiments.

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Mads T. Frandsen, Ulrich Haisch, Felix Kahlhoefer, Philipp Mertsch, Kai Schmidt-Hoberg. 2012-12-03. Loop-induced dark matter direct detection signals from gamma-ray lines. https://doi.org/10.1088/1475-7516%2F2012%2F10%2F033

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