The relic abundance of long-lived heavy colored particles

Junhai Kang, Markus A. Luty, Salah Nasri

Research output: Contribution to journalArticlepeer-review

69 Citations (Scopus)


Long-lived colored particles with masses ≳ m200 GeV are allowed by current accelerator searches, and are predicted by a number of scenarios for physics beyond the standard model. We argue that such ''heavy partons'' effectively have a geometrical cross section (of order 10 mb) for annihilation at temperatures below the QCD deconfinement transition. The annihilation process involves the formation of an intermediate bound state of two heavy partons with large orbital angular momentum. The bound state subsequently decays by losing energy and angular momentum to photon or pion emission, followed by annihilation of the heavy partons. This decay occurs before nucleosynthesis for m ≲ 10 11 GeV for electrically charged partons and m ≲ TeV for electrically neutral partons. This implies that heavy parton lifetimes as long as 10 14 sec are allowed even for heavy partons with m ∼ TeV decaying to photons or hadrons with significant branching fraction.

Original languageEnglish
Article number086
JournalJournal of High Energy Physics
Issue number9
Publication statusPublished - Sept 1 2008
Externally publishedYes


  • Cosmology of theories beyond the SM
  • QCD

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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