dorsal/arxiv
View SchemaThermal quark production in ultra-relativistic nuclear collisions
| Authors | Tanguy Altherr, David Seibert |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9311028 |
| URL | https://arxiv.org/abs/nucl-th/9311028 |
| DOI | 10.1103/PhysRevC.49.1684 |
| Journal | Phys.Rev.C49:1684-1692,1994 |
Abstract
We calculate thermal production of u, d, s, c and b quarks in ultra-relativistic heavy ion collisions. The following processes are taken into account: thermal gluon decay (g to ibar i), gluon fusion (g g to ibar i), and quark-antiquark annihilation (jbar j to ibar i), where i and j represent quark species. We use the thermal quark masses, $m_i^2(T)\simeq m_i^2 + (2g^2/9)T^2$, in all the rates. At small mass ($m_i(T)<2T$), the production is largely dominated by the thermal gluon decay channel. We obtain numerical and analytic solutions of one-dimensional hydrodynamic expansion of an initially pure glue plasma. Our results show that even in a quite optimistic scenario, all quarks are far from chemical equilibrium throughout the expansion. Thermal production of light quarks (u, d and s) is nearly independent of species. Heavy quark (c and b) production is quite independent of the transition temperature and could serve as a very good probe of the initial temperature. Thermal quark production measurements could also be used to determine the gluon damping rate, or equivalently the magnetic mass.
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"abstract": "We calculate thermal production of u, d, s, c and b quarks in\nultra-relativistic heavy ion collisions. The following processes are taken into\naccount: thermal gluon decay (g to ibar i), gluon fusion (g g to ibar i), and\nquark-antiquark annihilation (jbar j to ibar i), where i and j represent quark\nspecies. We use the thermal quark masses, $m_i^2(T)\\simeq m_i^2 + (2g^2/9)T^2$,\nin all the rates. At small mass ($m_i(T)\u003c2T$), the production is largely\ndominated by the thermal gluon decay channel. We obtain numerical and analytic\nsolutions of one-dimensional hydrodynamic expansion of an initially pure glue\nplasma. Our results show that even in a quite optimistic scenario, all quarks\nare far from chemical equilibrium throughout the expansion. Thermal production\nof light quarks (u, d and s) is nearly independent of species. Heavy quark (c\nand b) production is quite independent of the transition temperature and could\nserve as a very good probe of the initial temperature. Thermal quark production\nmeasurements could also be used to determine the gluon damping rate, or\nequivalently the magnetic mass.",
"arxiv_id": "nucl-th/9311028",
"authors": [
"Tanguy Altherr",
"David Seibert"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1103/PhysRevC.49.1684",
"journal_ref": "Phys.Rev.C49:1684-1692,1994",
"title": "Thermal quark production in ultra-relativistic nuclear collisions",
"url": "https://arxiv.org/abs/nucl-th/9311028"
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