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Title: Dibaryons cannot be the dark matter

Journal Article · · Physical Review. D.

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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Most Strange Dibaryon from Lattice QCD journal May 2018
Perhaps a Stable Dihyperon journal March 1977
Nuclear and nucleon transitions of the H dibaryon journal July 2004
Six flavor quark matter journal June 2018
Deeply bound dibaryon is incompatible with neutron stars and supernovae journal February 2019
Perhaps a Stable Dihyperon journal January 1977
Bound H Dibaryon in Flavor SU(3) Limit of Lattice QCD journal April 2011
Dark matter in the standard model? journal September 2018
Why Should Baryons and Exotic Relic Particles have Comparable Densities? journal January 1987
Cosmic separation of phases journal July 1984
p − p ,   p − Λ , and Λ − Λ correlations studied via femtoscopy in p p reactions at s = 7 TeV journal February 2019
A precision test of the nature of Dark Matter and a probe of the QCD phase transition preprint January 2018

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