Abstract
The hypothetical flavor-singlet dibaryon state with strangeness 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 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 account for at most of the baryon number and, thus, cannot be the dark matter. Although it is not the dark matter, if the exists, it might be an interesting relic.
- Received 19 September 2018
DOI:https://doi.org/10.1103/PhysRevD.99.063519
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society