dorsal/arxiv
View SchemaHot Hypernuclear Matter in the Modified Quark Meson Coupling Model
| Authors | I. Zakout, H. R. Jaqaman, S. Pal, H. Stöcker, W. Greiner |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9904084 |
| URL | https://arxiv.org/abs/nucl-th/9904084 |
| DOI | 10.1103/PhysRevC.61.055208 |
| Journal | Phys.Rev. C61 (2000) 055208 |
Abstract
Hot hypernuclear matter is investigated in an explicit SU(3) quark model based on a mean field description of nonoverlapping baryon bags bound by the self-consistent exchange of scalar $\sigma, \zeta$ and vector $\omega, \phi$ mesons. The $\sigma, \omega$ mean fields are assumed to couple to the u,d-quarks while the $\zeta, \phi$ mean fields are coupled to the s-quark. The coupling constants of the mean fields with the quarks are assumed to satisfy SU(6) symmetry. The calculations take into account the medium dependence of the bag parameter on the scalar fields $\sigma, \zeta$. We consider only the octet baryons $N,\Lambda,\Sigma,\Xi$ in hypernuclear matter. An ideal gas of the strange mesons $K$ and $K^{*}$ is introduced to keep zero net strangeness density. Our results for symmetric hypernuclear matter show that a phase transition takes place at a critical temperature around 180 MeV in which the scalar mean fields $\sigma, \zeta$ take nonzero values at zero baryon density. Furthermore, the bag contants of the baryons decrease significantly at and above this critical temperature indicating the onset of quark deconfinement. The present results imply that the onset of quark deconfinement in SU(3) hypernuclear matter is much stronger than in SU(2) nuclear matter.
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"abstract": "Hot hypernuclear matter is investigated in an explicit SU(3) quark model\nbased on a mean field description of nonoverlapping baryon bags bound by the\nself-consistent exchange of scalar $\\sigma, \\zeta$ and vector $\\omega, \\phi$\nmesons. The $\\sigma, \\omega$ mean fields are assumed to couple to the\nu,d-quarks while the $\\zeta, \\phi$ mean fields are coupled to the s-quark. The\ncoupling constants of the mean fields with the quarks are assumed to satisfy\nSU(6) symmetry. The calculations take into account the medium dependence of the\nbag parameter on the scalar fields $\\sigma, \\zeta$. We consider only the octet\nbaryons $N,\\Lambda,\\Sigma,\\Xi$ in hypernuclear matter. An ideal gas of the\nstrange mesons $K$ and $K^{*}$ is introduced to keep zero net strangeness\ndensity. Our results for symmetric hypernuclear matter show that a phase\ntransition takes place at a critical temperature around 180 MeV in which the\nscalar mean fields $\\sigma, \\zeta$ take nonzero values at zero baryon density.\nFurthermore, the bag contants of the baryons decrease significantly at and\nabove this critical temperature indicating the onset of quark deconfinement.\nThe present results imply that the onset of quark deconfinement in SU(3)\nhypernuclear matter is much stronger than in SU(2) nuclear matter.",
"arxiv_id": "nucl-th/9904084",
"authors": [
"I. Zakout",
"H. R. Jaqaman",
"S. Pal",
"H. St\u00f6cker",
"W. Greiner"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.61.055208",
"journal_ref": "Phys.Rev. C61 (2000) 055208",
"title": "Hot Hypernuclear Matter in the Modified Quark Meson Coupling Model",
"url": "https://arxiv.org/abs/nucl-th/9904084"
},
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