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Transport theory for a scalar quark & gluon model

  • D.S. Isert
  • S.P. Klevansky

Abstract:

A model for scalar quarks and gluons that successfully gives rise to a ln s behavior in high-energy qq scattering and which contains a non-trivial three-gluon vertex is used to study collision theory with the following aspects: i) A three-body interaction simulating QCD is present and ii) particle production and annihilation occur naturally. In this paper, the collision term in the model is examined in detail in the quasiparticle approximation. The construction of cross-sections in which self-energy terms are ordered according to a coupling constant expansion is undertaken. It is shown explicitly which terms of second order are required to obtain the scattering amplitudes that are two body in nature. Additional ordering in the number of colors shows that quark loop diagrams are suppressed and gluon production or scattering processes dominate. It is also shown that a consistent calculation of the scattering graphs at the two-loop level also simultaneously yields terms that renormalize one-loop level graphs. This can then be extended to arbitrary mn processes. We examine the constraint equation briefly, discussing the appearance of a width. The issue of pinch singularities is also addressed, and examples of the elimination of such singularities in equilibrium are given explicitly.

PACS. 12.40.-y Other models for strong interactions – 05.20.Dd Kinetic theory – 12.38.Mh Quark-gluon plasma – 24.85.+p Quarks, gluons, and QCD in nuclei and nuclear processes 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2001

Authors and Affiliations

  • D.S. Isert
    • 1
  • S.P. Klevansky
    • 1
  1. 1.Institut für Theoretische Physik, Philosophenweg 19, D-69120 Heidelberg, GermanyDE

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