Search for exotic strange quark matter in high energy nuclear reactions

Armstrong, T. A.; Barish, K. N.; Bennett, S.; Chikanian, A.; Coe, S. D.; Cormier, Thomas Michael; Davies, R.; Cataldo, G. de; Dee, P.; Diebold, G. E.; Dover, C.B.; Fachini, P.; Finch, E.; George, N.; Giglietto, N.; Greene, S. V.; Haridas, P.; Hill, J. C.; Hirsch, A. S.; Hoversten, R.; Huang, H. Z.; Kim, B.; Kumar, B. S.; Lainis, T.; Lajoie, J. G.; Lewis, R. A.; Libby, Bruce; Majka, R.; Munhoz, M. G.; Nagle, J. L.; Pless, I. A.; Pope, J.; Porile, N.; Pruneau, C.; Rabin, M. S. Z.; Rainò, A.; Reid, John D.; Rimai, A.; Rotondo, F. S.; Sandweiss, J.; Scharenberg, R. P.; Slaughter, A. J.; Smith, Gerald A.; Spinelli, P.; Tincknell, M.; Toothacker, W. S.; Buren, G. Van; Wohn, F. K.; Xu, Z.; Zhao, K.

doi:10.1016/s0375-9474(97)00399-0

Cited by 20 publications

(7 citation statements)

References 29 publications

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“…We note that such strangeness distillation has been foreseen to occur [17], and specifically in this manner if QGP phase hadronizes at temperatures found in our fits of the data [18]. This dynamical distillation process stimulated several searches for strangeletts, i.e., (quasi) stable highly strange hadrons with more than three strange quarks [19,20]. …”

Section: Analysis Of Experimental Resultssupporting

confidence: 53%

Chemical nonequilibrium and deconfinement in 200AGeV sulphur induced reactions

Letessier

Rafelski

1999

Phys. Rev. C

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We interpret hadronic particle abundances produced in S-Au/W/Pb 200 A GeV reactions in terms of the final state hadronic phase space model and determine by a data fit of the chemical hadron freeze-out parameters. Allowing for the flavor abundance non-equilibrium a highly significant fit to experimental particle abundance data emerges, which supports possibility of strangeness distillation. We find under different strategies stable values for freeze-out temperature T f = 143 ± 3 MeV, baryochemical potential µ B = 173 ± 6 MeV, ratio of strangeness (γ s ) and light quark (γ q ) phase space occupancies γ s /γ q = 0.60 ± 0.02, and γ q = 1.22 ± 0.05 without accounting for collective expansion (radial flow). When introducing flow effects which allow a consistent description of the transverse mass particle spectra, yielding | v c | = 0.49 ± 0.01 c, we find γ s /γ q = 0.69 ± 0.03 , γ q = 1.41 ± 0.08. The strange quark fugacity is fitted at λ s = 1.00 ± 0.02 suggesting chemical freeze-out directly from the deconfined phase.

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Section: Analysis Of Experimental Resultssupporting

confidence: 53%

Chemical nonequilibrium and deconfinement in 200AGeV sulphur induced reactions

Letessier

Rafelski

1999

Phys. Rev. C

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“…However, the strange quark is heavy compared with up and down quarks, and this mass counteracts the advantage from the Pauli principle. No strange quark matter has been found experimentally so far [78]. The issue of stability of strange quark matter has not been settled yet; for a recent review see [79].…”

Section: Quark Nuggets/strangeletsmentioning

confidence: 99%

The first second of the Universe

2003

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The history of the Universe after its first second is now tested by high quality observations of light element abundances and temperature anisotropies of the cosmic microwave background. The epoch of the first second itself has not been tested directly yet; however, it is constrained by experiments at particle and heavy ion accelerators. Here I attempt to describe the epoch between the electroweak transition and the primordial nucleosynthesis. The most dramatic event in that era is the quark--hadron transition at 10 $\mu$s. Quarks and gluons condense to form a gas of nucleons and light mesons, the latter decay subsequently. At the end of the first second, neutrinos and neutrons decouple from the radiation fluid. The quark--hadron transition and dissipative processes during the first second prepare the initial conditions for the synthesis of the first nuclei. As for the cold dark matter (CDM), WIMPs (weakly interacting massive particles) -- the most popular candidates for the CDM -- decouple from the presently known forms of matter, chemically (freeze-out) at 10 ns and kinetically at 1 ms. The chemical decoupling fixes their present abundances and dissipative processes during and after thermal decoupling set the scale for the very first WIMP clouds.Comment: review to appear in Annalen der Physik (51 pages, 16 figures); references added (v2); typos corrected, resembles published version (v3

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“…E864 is an open geometry, high data rate spectrometer designed to search for strangelets [5,6,7] and measure the production of many particle species in high energy nucleus-nucleus collisions at the AGS. We can have two relatively independent mass measurements with the E864 apparatus( Fig 1) : the tracking system and the hadronic calorimeter.…”

Section: E864 Apparatusmentioning

confidence: 99%

Search for positively charged strangelets and other related results with E864 at the AGS

1999

J. Phys. G: Nucl. Part. Phys.

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We report on the latest results in the search for positively charged strangelets from E864's 96/97 run at the AGS with sensitivity of about 8 × 10 −9 per central collision. This contribution also contains new results of a search for highly charged strangelets with Z = +3. Production of light nuclei, such as 6 He and 6 Li, is presented as well. Measurements of yields of these rarely produced isotopes near midrapidity will help constrain the production levels of strangelets via coalescence. E864 also measures antiproton production which includes decays from antihyperons. Comparisons with antiproton yields measured by E878 as a function of centrality indicate a large antihyperon-to-antiproton ratio in central collisions.

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Search for exotic strange quark matter in high energy nuclear reactions

Cited by 20 publications

References 29 publications

Chemical nonequilibrium and deconfinement in 200AGeV sulphur induced reactions

Chemical nonequilibrium and deconfinement in 200AGeV sulphur induced reactions

The first second of the Universe

Search for positively charged strangelets and other related results with E864 at the AGS

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