Direct constraints on charged excitations of dark matter

Haipeng An, Maxim Pospelov, Josef Pradler

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


If the neutral component of weak-scale dark matter is accompanied by a charged excitation separated by a mass gap of less than ∼20 MeV, weakly interacting massive particles (WIMPs) can form stable bound states with nuclei. We show that the recent progress in experiments searching for neutrinoless double-beta decay sets the first direct constraint on the exoergic reaction of WIMP-nucleus bound state formation. We calculate the rate for such a process in representative models and show that the double-beta decay experiments provide unique sensitivity to a large fraction of parameter space of the WIMP doublet model, complementary to constraints imposed by cosmology and direct collider searches.

Original languageEnglish (US)
Article number251302
JournalPhysical review letters
Issue number25
StatePublished - Dec 20 2012
Externally publishedYes


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