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Alter: pages, bibcode, doi, title, template type. Add: pages, issue, volume, journal, bibcode, doi, year, class, eprint, date, arxiv, author pars. 1-5. Removed URL that duplicated unique identifier. Formatted dashes. Some additions/deletions were actually parameter name changes. | You can use this tool yourself. Report bugs here. | via #UCB_Gadget
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|year=1960
|year=1960
|title=The Degenerate Superdense Gas of Elementary Particles
|title=The Degenerate Superdense Gas of Elementary Particles
|url=http://articles.adsabs.harvard.edu/full/1960SvA.....4..187A
|journal=[[Soviet Astronomy]]
|journal=[[Soviet Astronomy]]
|volume=37 |issue= |pages=193
|volume=37 |issue= |pages=193
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|title=A new possibility for light-quark dark matter
|title=A new possibility for light-quark dark matter
|journal=[[Journal of Physics G]]
|journal=[[Journal of Physics G]]
|volume=47 |issue=3 |pages=
|volume=47 |issue=3 |pages=03LT01
|bibcode=
|bibcode=2020arXiv200108654B
|doi=10.1088/1361-6471/ab67e8
|doi=
|arxiv=2001.08654
}}</ref><ref>{{cite web
}}</ref><ref>{{cite web
|url=https://www.sciencealert.com/d-star-hexaquark-particles-could-be-responsible-for-creating-dark-matter
|url=https://www.sciencealert.com/d-star-hexaquark-particles-could-be-responsible-for-creating-dark-matter
|title=Physicists Think We Might Have a New, Exciting Dark Matter Candidate
|title=Physicists Think We Might Have a New, Exciting Dark Matter Candidate
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}}</ref> As per researchers, this result indicates that during the earliest moments after the Big Bang, as the cosmos slowly cooled, stable d*(2830) hexaquarks could have formed alongside baryonic matter, and the production rate of this particle would have been sufficient to account for the 85% of the Universe’s mass that is believed to be Dark Matter.<ref>{{cite web
}}</ref> As per researchers, this result indicates that during the earliest moments after the Big Bang, as the cosmos slowly cooled, stable d*(2830) hexaquarks could have formed alongside baryonic matter, and the production rate of this particle would have been sufficient to account for the 85% of the Universe’s mass that is believed to be Dark Matter.<ref>{{cite web
|url=https://www.universetoday.com/145345/is-the-d-star-hexaquark-the-dark-matter-particle/
|url=https://www.universetoday.com/145345/is-the-d-star-hexaquark-the-dark-matter-particle/
|title=Is the “D-star Hexaquark” the Dark Matter Particle?
|title=Is the "D-star Hexaquark" the Dark Matter Particle?
|date=2020-03-11
}}</ref>
}}</ref>


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|url=https://steemit.com/steemstem/@lemouth/the-mysteries-of-quantum-chromodynamics-from-quarks-to-the-sexy-sexaquark
|url=https://steemit.com/steemstem/@lemouth/the-mysteries-of-quantum-chromodynamics-from-quarks-to-the-sexy-sexaquark
|title=The mysteries of quantum chromodynamics: from quarks to the sexy sexaquark
|title=The mysteries of quantum chromodynamics: from quarks to the sexy sexaquark
}}</ref><ref>{{cite web
}}</ref><ref>{{cite arXiv
|url=https://arxiv.org/abs/1708.08951
|title=Stable Sexaquark
|title=Stable Sexaquark
|eprint=1708.08951
⚫
}}</ref><ref name=sexquarks/><ref>{{cite web
|last1=Farrar
⚫
|url=https://link.aps.org/doi/10.1103/PhysRevD.99.063519
|first1=Glennys R.
|class=hep-ph
|year=2017
⚫
}}</ref><ref name=sexquarks/><ref>{{cite journal
|title=Dibaryons cannot be the dark matter
|title=Dibaryons cannot be the dark matter
⚫
|doi=10.1103/PhysRevD.99.063519
⚫
}}</ref><ref>{{cite web
|arxiv=1809.06003
⚫
|url=https://link.aps.org/doi/10.1103/PhysRevD.98.063005
|bibcode=2019PhRvD..99f3519K
|year=2019
|last1=Kolb
|first1=Edward W.
|last2=Turner
|first2=Michael S.
|journal=Physical Review D
|volume=99
|issue=6
|pages=063519
⚫
}}</ref><ref>{{cite journal
|title=Dark matter in the standard model?
|title=Dark matter in the standard model?
⚫
|doi=10.1103/PhysRevD.98.063005
⚫
}}</ref><ref>{{cite web
|arxiv=1803.10242
⚫
|url=https://link.springer.com/article/10.1023/A:1025702431127
|bibcode=2018PhRvD..98f3005G
|year=2018
|last1=Gross
|first1=Christian
|last2=Polosa
|first2=Antonello
|last3=Strumia
|first3=Alessandro
|last4=Urbano
|first4=Alfredo
|last5=Xue
|first5=Wei
|journal=Physical Review D
|volume=98
|issue=6
|pages=063005
⚫
}}</ref><ref>{{cite journal
|title=A Stable H-Dibaryon: Dark Matter, Candidate Within QCD?
|title=A Stable H-Dibaryon: Dark Matter, Candidate Within QCD?
⚫
|doi=10.1023/A:1025702431127
|year=2003
|last1=Farrar
|first1=Glennys R.
|journal=International Journal of Theoretical Physics
|volume=42
|issue=6
|pages=1211–1218
}}</ref><ref>{{cite web
}}</ref><ref>{{cite web
|url=http://vietnam.in2p3.fr/2019/longlived/transparencies/03_thursday/01_morning/01_farrar.pdf
|url=http://vietnam.in2p3.fr/2019/longlived/transparencies/03_thursday/01_morning/01_farrar.pdf
|title=Stable Sexaquark: Dark Matter predictions, constraints and lab detection
|title=Stable Sexaquark: Dark Matter predictions, constraints and lab detection
}}</ref> As per one analysis, a hypothetical SU(3) flavor-singlet, highly symmetric, deeply bound neutral scalar hexaquark S=uuddss, which due to its features has escaped from experimental detection so far, may be considered as a candidate for a [[baryonic dark matter]], but, existence of this state may contradict to stability of the oxygen nuclei, which requires further thorough analysis.<ref>{{cite web
}}</ref> As per one analysis, a hypothetical SU(3) flavor-singlet, highly symmetric, deeply bound neutral scalar hexaquark S=uuddss, which due to its features has escaped from experimental detection so far, may be considered as a candidate for a [[baryonic dark matter]], but, existence of this state may contradict to stability of the oxygen nuclei, which requires further thorough analysis.<ref>{{cite arXiv
|url=https://arxiv.org/abs/1904.09913
|title=The Scalar Hexaquark uuddss: a Candidate to Dark Matter?
|title=The Scalar Hexaquark uuddss: a Candidate to Dark Matter?
|eprint=1904.09913
|last1=Azizi
|first1=K.
|last2=Agaev
|first2=S. S.
|last3=Sundu
|first3=H.
|class=hep-ph
|year=2019
}}</ref>
}}</ref>


Revision as of 04:04, 13 March 2020

File:H dibaryon.jpg
A dibaryon-type hexaquark. There are two constituent quarks for each of the three colour charges.

In particle physics hexaquarks, alternatively known as sexaquarks[1], are a large family of hypothetical particles, each particle consisting of six quarks or antiquarks of any flavours. Six constituent quarks in any of several combinations could yield a colour charge of zero; for example a hexaquark might contain either six quarks, resembling two baryons bound together (a dibaryon), or three quarks and three antiquarks.[2] Once formed, dibaryons are predicted to be fairly stable by the standards of particle physics.

A number of experiments have been suggested to detect dibaryon decays and interactions. In the 1990s several candidate dibaryon decays were observed but they were not confirmed.[3][4][5]

There is a theory that strange particles such as hyperons[6] and dibaryons[7] could form in the interior of a neutron star, changing its mass–radius ratio in ways that might be detectable. Accordingly, measurements of neutron stars could set constraints on possible dibaryon properties.[8] A large fraction of the neutrons in a neutron star could turn into hyperons and merge into dibaryons during the early part of its collapse into a black hole [citation needed]. These dibaryons would very quickly dissolve into quark–gluon plasma during the collapse, or go into some currently unknown state of matter.

D-star hexaquark

In 2014 a potential dibaryon was detected at the Jülich Research Center at about 2380 MeV. The center claimed that the measurements confirm results from 2011, via a more replicable method.[9][10] The particle existed for 10−23 seconds and was named d*(2380).[11] This particle is hypothesized to consist of three up and three down quarks, and has been proposed as a candidate for dark matter.[12][13][14]

It is theorized that, groups of d-stars could form substances known as Bose-Einstein Condensates —due to prevailing low temperatures in the early universe — a state in which they overlap and blend together, a bit like the protons and neutrons inside atoms. Under the right conditions, BECs made of hexaquarks with trapped electrons could behave like dark matter.[15] As per researchers, this result indicates that during the earliest moments after the Big Bang, as the cosmos slowly cooled, stable d*(2830) hexaquarks could have formed alongside baryonic matter, and the production rate of this particle would have been sufficient to account for the 85% of the Universe’s mass that is believed to be Dark Matter.[16]

H di-baryon

In 1977 Robert Jaffe proposed that a possibly stable H dibaryon with the quark composition udsuds could notionally result from the combination of two uds hyperons.[17] Calculations have shown that this particle is light and (meta)stable. It actually takes more than twice the age of the universe to decay. Data constrains the existence of such a particle, and it turns out that it is still allowed.[18][19][1][20][21][22][23] As per one analysis, a hypothetical SU(3) flavor-singlet, highly symmetric, deeply bound neutral scalar hexaquark S=uuddss, which due to its features has escaped from experimental detection so far, may be considered as a candidate for a baryonic dark matter, but, existence of this state may contradict to stability of the oxygen nuclei, which requires further thorough analysis.[24]

See also

References

  1. ^ a b "Oddball sexaquark particles could be immortal, if they exist at all".
  2. ^ Vijande, J.; Valcarce, A; Richard, J.-M. (25 November 2011). "Stability of hexaquarks in the string limit of confinement". Physical Review D. 85 (1): 014019. arXiv:1111.5921. Bibcode:2012PhRvD..85a4019V. doi:10.1103/PhysRevD.85.014019.
  3. ^ J. Belz et al. (BNL-E888 Collaboration) (1996). "Search for the weak decay of an H dibaryon". Physical Review Letters. 76 (18): 3277–3280. arXiv:hep-ex/9603002. Bibcode:1996PhRvL..76.3277B. doi:10.1103/PhysRevLett.76.3277. PMID 10060926.{{cite journal}}: CS1 maint: numeric names: authors list (link)
  4. ^ R. W. Stotzer et al. (BNL-E836 Collaboration) (1997). "Search for H dibaryon in He-3 (K-, k+) Hn". Physical Review Letters. 78 (19): 3646–36490. Bibcode:1997PhRvL..78.3646S. doi:10.1103/PhysRevLett.78.3646.{{cite journal}}: CS1 maint: numeric names: authors list (link)
  5. ^ A. Alavi-Harati et al. (KTeV Collaboration) (2000). "Search for the weak decay of a lightly bound H0 dibaryon". Physical Review Letters. 84 (12): 2593–2597. arXiv:hep-ex/9910030. Bibcode:2000PhRvL..84.2593A. doi:10.1103/PhysRevLett.84.2593. PMID 11017277.
  6. ^ V. A. Ambartsumyan; G. S. Saakyan (1960). "The Degenerate Superdense Gas of Elementary Particles". Soviet Astronomy. 37: 193. Bibcode:1960SvA.....4..187A.
  7. ^ S. Kagiyama; A. Nakamura; T. Omodaka (1992). "Compressible bag model and dibaryon stars". Zeitschrift für Physik C. 56 (4): 557–560. Bibcode:1992ZPhyC..56..557K. doi:10.1007/BF01474728.
  8. ^ A. Faessler; A. J. Buchmann; M. I. Krivoruchenko (1997). "Constraints to coupling constants of the ω- and σ-mesons with dibaryons". Physical Review C. 56 (3): 1576–1581. arXiv:nucl-th/9706080. Bibcode:1997PhRvC..56.1576F. doi:10.1103/PhysRevC.56.1576.
  9. ^ "Forschungszentrum Jülich press release".
  10. ^ "Massive news in the micro-world: a hexaquark particle".
  11. ^ P. Adlarson; et al. (2014). "Evidence for a New Resonance from Polarized Neutron-Proton Scattering". Physical Review Letters. 112 (2): 202301. arXiv:1402.6844. Bibcode:2014PhRvL.112t2301A. doi:10.1103/PhysRevLett.112.202301.
  12. ^ M. Bashkanov (2020). "A new possibility for light-quark dark matter". Journal of Physics G. 47 (3): 03LT01. arXiv:2001.08654. Bibcode:2020arXiv200108654B. doi:10.1088/1361-6471/ab67e8.
  13. ^ "Physicists Think We Might Have a New, Exciting Dark Matter Candidate".
  14. ^ "Did this newfound particle form the universe's dark matter?".
  15. ^ "Did German physicists accidentally discover dark matter in 2014?".
  16. ^ "Is the "D-star Hexaquark" the Dark Matter Particle?". 2020-03-11.
  17. ^ R. L. Jaffe (1977). "Perhaps a Stable Dihyperon?". Physical Review Letters. 38 (5): 195–198. Bibcode:1977PhRvL..38..195J. doi:10.1103/PhysRevLett.38.195.
  18. ^ "The mysteries of quantum chromodynamics: from quarks to the sexy sexaquark".
  19. ^ Farrar, Glennys R. (2017). "Stable Sexaquark". arXiv:1708.08951 [hep-ph].
  20. ^ Kolb, Edward W.; Turner, Michael S. (2019). "Dibaryons cannot be the dark matter". Physical Review D. 99 (6): 063519. arXiv:1809.06003. Bibcode:2019PhRvD..99f3519K. doi:10.1103/PhysRevD.99.063519.
  21. ^ Gross, Christian; Polosa, Antonello; Strumia, Alessandro; Urbano, Alfredo; Xue, Wei (2018). "Dark matter in the standard model?". Physical Review D. 98 (6): 063005. arXiv:1803.10242. Bibcode:2018PhRvD..98f3005G. doi:10.1103/PhysRevD.98.063005.
  22. ^ Farrar, Glennys R. (2003). "A Stable H-Dibaryon: Dark Matter, Candidate Within QCD?". International Journal of Theoretical Physics. 42 (6): 1211–1218. doi:10.1023/A:1025702431127.
  23. ^ "Stable Sexaquark: Dark Matter predictions, constraints and lab detection" (PDF).
  24. ^ Azizi, K.; Agaev, S. S.; Sundu, H. (2019). "The Scalar Hexaquark uuddss: a Candidate to Dark Matter?". arXiv:1904.09913 [hep-ph].
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