Elastic scattering and transport coefficients for a quark plasma in SUf(3) at finite temperatures
Abstract
The temperature dependence of the elastic-scattering processes qq' → qq' and q overlineq' → q overlineq' , with q, q' = u, d, s is studied as a function of the scattering angle and the center-of-mass energy of the collision within the framework of the SUf(3) Nambu-Jona-Lasinio model. Critical scattering at threshold is observed in the q overlineq' → q overlineq' process, leading to an enhancement of the cross section as occurs in the phenomenon of critical opalescence. Transport properties such as viscosity, mean free paths and thermal relaxation times are calculated. Strangeness enhancement is investigated via the chemical relaxation times, which are found to be considerably higher than those calculated via perturbative QCD. A comparison with the experimental values for the strangeness enhancement in S + S collisions leads to an upper limit of 4 fm/ c for the lifetime of the plasma.
- Publication:
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Nuclear Physics A
- Pub Date:
- February 1996
- DOI:
- 10.1016/0375-9474(96)00247-3
- arXiv:
- arXiv:hep-ph/9607263
- Bibcode:
- 1996NuPhA.608..356R
- Keywords:
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- High Energy Physics - Phenomenology
- E-Print:
- 35 pages ReVTeX, 18 PostScript figures, uufiles format, to appear in Nucl. Phys. A