dorsal/arxiv
View SchemaAspects of particle production in isospin asymmetric matter
| Authors | G. Ferini, M. Colonna, T. Gaitanos, M. Di Toro |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0504032 |
| URL | https://arxiv.org/abs/nucl-th/0504032 |
| DOI | 10.1016/j.nuclphysa.2005.08.007 |
| Journal | Nucl.Phys.A762:147-166,2005 |
Abstract
The production/absorption rate of particles in compressed and heated asymmetric matter is studied using a Relativistic Mean Field (RMF) transport model with an isospin dependent collision term. Just from energy conservation in the elementary production/absorption processes we expect to see a strong dependence of the yields on the basic Lorentz structure of the isovector effective interaction, due to isospin effects on the scalar and vector self-energies of the hadrons. This will be particularly evident for the ratio of the rates of particles produced with different charges: results are shown for \pi(+)/\pi(-), K(+)/K(0) yields. In order to simplify the analysis we perform RMF cascade simulations in a box with periodic boundary conditions. In this way we can better pin down all such fine relativistic effects in particle production, that could likely show up even in realistic heavy ion collisions. In particular, K(+,0) production is expected to be directly related to the high density behaviour of the symmetry energy, since kaons are produced very early during the high density stage of the collision and their mean free path is rather large. We show that the K(+)/K(0) ratio reflects important isospin contributions on the production rates just because of the large sensitivity around the threshold. The results are very promising for the possibility of a direct link between particle production data in exotic Heavy Ion Collisions and the isospin dependent part of the Equation of State at high baryon densities.
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"abstract": "The production/absorption rate of particles in compressed and heated\nasymmetric matter is studied using a Relativistic Mean Field (RMF) transport\nmodel with an isospin dependent collision term. Just from energy conservation\nin the elementary production/absorption processes we expect to see a strong\ndependence of the yields on the basic Lorentz structure of the isovector\neffective interaction, due to isospin effects on the scalar and vector\nself-energies of the hadrons. This will be particularly evident for the ratio\nof the rates of particles produced with different charges: results are shown\nfor \\pi(+)/\\pi(-), K(+)/K(0) yields. In order to simplify the analysis we\nperform RMF cascade simulations in a box with periodic boundary conditions. In\nthis way we can better pin down all such fine relativistic effects in particle\nproduction, that could likely show up even in realistic heavy ion collisions.\nIn particular, K(+,0) production is expected to be directly related to the high\ndensity behaviour of the symmetry energy, since kaons are produced very early\nduring the high density stage of the collision and their mean free path is\nrather large. We show that the K(+)/K(0) ratio reflects important isospin\ncontributions on the production rates just because of the large sensitivity\naround the threshold. The results are very promising for the possibility of a\ndirect link between particle production data in exotic Heavy Ion Collisions and\nthe isospin dependent part of the Equation of State at high baryon densities.",
"arxiv_id": "nucl-th/0504032",
"authors": [
"G. Ferini",
"M. Colonna",
"T. Gaitanos",
"M. Di Toro"
],
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],
"doi": "10.1016/j.nuclphysa.2005.08.007",
"journal_ref": "Nucl.Phys.A762:147-166,2005",
"title": "Aspects of particle production in isospin asymmetric matter",
"url": "https://arxiv.org/abs/nucl-th/0504032"
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