dorsal/arxiv
View SchemaParticle Production from SIS to SPS Energies
| Authors | W. Cassing |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9702053 |
| URL | https://arxiv.org/abs/nucl-th/9702053 |
Abstract
The production and propagation of mesons ($\pi, \eta, \rho, \omega, \Phi, K, \bar{K}, J/\Psi$) in proton-nucleus and nucleus-nucleus collisions from 1 - 200 GeV/u is studied within the covariant transport approach HSD, which explicitly allows to investigate selfenergy effects of the hadrons at finite baryon density. Whereas the experimental pion and $K^+$ spectra can be described without introducing any selfenergies for the mesons, the $K^-$ yield in Ni + Ni collisions is underestimated by a factor of 5 - 7 at 1.66 and 1.85 GeV/u. However, introducing density dependent antikaon masses in line with effective chiral Lagrangians a satisfactory agreement with the data is achieved. A dropping of the $\rho$-meson mass with baryon density, as suggested by QCD sumrule studies, is proposed to explain the dilepton spectra for S + Au and Pb + Au at SPS energies, which indicates independently that a partial restoration of chiral symmetry might be found already in the present experiments.
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"abstract": "The production and propagation of mesons ($\\pi, \\eta, \\rho, \\omega, \\Phi, K,\n\\bar{K}, J/\\Psi$) in proton-nucleus and nucleus-nucleus collisions from 1 - 200\nGeV/u is studied within the covariant transport approach HSD, which explicitly\nallows to investigate selfenergy effects of the hadrons at finite baryon\ndensity. Whereas the experimental pion and $K^+$ spectra can be described\nwithout introducing any selfenergies for the mesons, the $K^-$ yield in Ni + Ni\ncollisions is underestimated by a factor of 5 - 7 at 1.66 and 1.85 GeV/u.\nHowever, introducing density dependent antikaon masses in line with effective\nchiral Lagrangians a satisfactory agreement with the data is achieved. A\ndropping of the $\\rho$-meson mass with baryon density, as suggested by QCD\nsumrule studies, is proposed to explain the dilepton spectra for S + Au and Pb\n+ Au at SPS energies, which indicates independently that a partial restoration\nof chiral symmetry might be found already in the present experiments.",
"arxiv_id": "nucl-th/9702053",
"authors": [
"W. Cassing"
],
"categories": [
"nucl-th"
],
"title": "Particle Production from SIS to SPS Energies",
"url": "https://arxiv.org/abs/nucl-th/9702053"
},
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