dorsal/arxiv
View Schema$\Sigma^-/\Sigma^+$ ratio as a candidate for probing the density dependence of the symmetry potential at high nuclear densities
| Authors | Qingfeng LI, Zhuxia LI, Enguang Zhao, Raj K. Gupta |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0504065 |
| URL | https://arxiv.org/abs/nucl-th/0504065 |
| DOI | 10.1103/PhysRevC.71.054907 |
| Journal | Phys.Rev. C71 (2005) 054907 |
Abstract
Based on the UrQMD model, we have investigated the influence of the symmetry potential on the negatively and positively charged $\pi$ and $\Sigma$ hyperon production ratios in heavy ion collisions at the SIS energies. We find that, in addition to $\pi^-/\pi^+$ ratio, the $\Sigma^-/\Sigma^+$ ratio can be taken as a sensitive probe for investigating the density dependence of the symmetry potential of nuclear matter at high densities (1-4 times of normal baryon density). This sensitivity of the symmetry potential to both the $\pi^-/\pi^+$ and $\Sigma^-/\Sigma^+$ ratios is found to depend strongly on the incident beam energy. Furthermore, the $\Sigma^-/\Sigma^+$ ratio is shown to carry the information about the isospin-dependent part of the $\Sigma$ hyperon single-particle potential.
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"abstract": "Based on the UrQMD model, we have investigated the influence of the symmetry\npotential on the negatively and positively charged $\\pi$ and $\\Sigma$ hyperon\nproduction ratios in heavy ion collisions at the SIS energies. We find that, in\naddition to $\\pi^-/\\pi^+$ ratio, the $\\Sigma^-/\\Sigma^+$ ratio can be taken as\na sensitive probe for investigating the density dependence of the symmetry\npotential of nuclear matter at high densities (1-4 times of normal baryon\ndensity). This sensitivity of the symmetry potential to both the $\\pi^-/\\pi^+$\nand $\\Sigma^-/\\Sigma^+$ ratios is found to depend strongly on the incident beam\nenergy. Furthermore, the $\\Sigma^-/\\Sigma^+$ ratio is shown to carry the\ninformation about the isospin-dependent part of the $\\Sigma$ hyperon\nsingle-particle potential.",
"arxiv_id": "nucl-th/0504065",
"authors": [
"Qingfeng LI",
"Zhuxia LI",
"Enguang Zhao",
"Raj K. Gupta"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.71.054907",
"journal_ref": "Phys.Rev. C71 (2005) 054907",
"title": "$\\Sigma^-/\\Sigma^+$ ratio as a candidate for probing the density dependence of the symmetry potential at high nuclear densities",
"url": "https://arxiv.org/abs/nucl-th/0504065"
},
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