Dibaryons cannot be the dark matter
- Univ. of Chicago, IL (United States)
The hypothetical SU(3) flavor-singlet dibaryon state S with strangeness –2 has been discussed as a dark-matter candidate capable of explaining the curious 5-to-1 ratio of the mass density of dark matter to that of baryons. We study the early-universe production of dibaryons and find that irrespective of the hadron abundances produced by the QCD quark/hadron transition, rapid particle reactions thermalized the S abundance, and it tracked equilibrium until it “froze out” at a tiny value. For the plausible range of dibaryon masses (1860–1890 MeV) and generous assumptions about its interaction cross sections, S’s account for at most 10–11 of the baryon number and, thus, cannot be the dark matter. Although it is not the dark matter, if the S exists, it might be an interesting relic.
- Research Organization:
- Univ. of Chicago, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); USDOE
- Grant/Contract Number:
- SC0009924; FG02-13ER41958
- OSTI ID:
- 1501725
- Alternate ID(s):
- OSTI ID: 1611253
- Journal Information:
- Physical Review. D., Vol. 99, Issue 6; ISSN 2470-0010
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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