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Thermal quark production in ultra-relativistic nuclear collisions
Nuclear Theory · Submitted 24 Nov 1993
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Our results show that even in a quite optimistic scenario, all quarks are far from chemical equilibrium throughout the expansion.
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The abstract, sentence by sentence
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.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We calculate thermal production of u, d, s, c and b quarks in ultra-relativistic heavy ion collisions. | contribution 1.00 | 0.95 | 0.04 | asserted 0.94 |
| s1 | 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. | method 0.98 | 0.63 | 0.02 | asserted 0.98 |
| s2 | We use the thermal quark masses, $m_i^2(T)\simeq m_i^2 + (2g^2/9)T^2$, in all the rates. | method 1.00 | 0.77 | 0.03 | asserted 1.00 |
| s3 | At small mass ($m_i(T)<2T$), the production is largely dominated by the thermal gluon decay channel. | result 0.99 | 0.77 | 0.08 | asserted 0.99 |
| s4 | We obtain numerical and analytic solutions of one-dimensional hydrodynamic expansion of an initially pure glue plasma. | method 0.91 | 0.95 | 0.04 | asserted 1.00 |
| s5 | Our results show that even in a quite optimistic scenario, all quarks are far from chemical equilibrium throughout the expansion. | result 0.99 | 0.95 | 0.60 | asserted 1.00 |
| s6 | Thermal production of light quarks (u, d and s) is nearly independent of species. | result 1.00 | 0.91 | 0.08 | asserted 0.99 |
| s7 | 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. | interpretation 0.58 | 0.89 | 0.14 | hedged possibility 0.60 |
| s8 | Thermal quark production measurements could also be used to determine the gluon damping rate, or equivalently the magnetic mass. | interpretation 0.81 | 0.26 | 0.06 | hedged possibility 1.00 |
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Original 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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How the literature uses it
1 arXiv paper cite this in 1 sentence
Papers whose main result relates to this one's
States the same result 2 papers
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We show that even under optimistic conditions, the quark-gluon system fails to achieve chemical equilibrium.
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We find that even under very optimistic conditions, complete chemical equilibration in the quark gluon plasma appears unlikely.
Thermal Masses and Equilibrium Rates in the Quark Gluon Phase · 0.94
Papers citing it
Uses its method or tool 1 paper
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The kinetic equations, we use, are similar to those used before for strangeness production and equilibration in QGP [ref] .
Particle production in matter at extreme conditions · Equation for particle density evolution and reaction rates · 0.96
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