Displaced vertices from X-ray lines

Adam Falkowski, Yonit Hochberg*, Joshua T. Ruderman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Abstract: We present a simple model of weak-scale thermal dark matter that gives rise to X-ray lines. Dark matter consists of two nearly degenerate states near the weak scale, which are populated thermally in the early universe via co-annihilation with slightly heavier states that are charged under the Standard Model. The X-ray line arises from the decay of the heavier dark matter component into the lighter one via a radiative dipole transition, at a rate that is slow compared to the age of the universe. The model predicts observable signatures at the LHC in the form of exotic events with missing energy and displaced leptons and jets. As an application, we show how this model can explain the recently observed 3.55 keV X-ray line.

Original languageAmerican English
Article number140
JournalJournal of High Energy Physics
Issue number11
StatePublished - Nov 2014
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2014, SISSA, Trieste, Italy.


  • Beyond Standard Model
  • Cosmology of Theories beyond the SM


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