Nonequilibrium QCD: Interplay of hard and soft dynamics in high-energy multi - gluon beams
Nov, 199652 pages
Published in:
- Phys.Rev.D 56 (1997) 2665-2701
e-Print:
- hep-ph/9611400 [hep-ph]
Report number:
- BNL-63632
Citations per year
Abstract:
A quantum-kinetic formulation of the dynamical evolution of a high-energy non-equilibrium gluon system at finite density is developed, to study the interplay between quantum fluctuations of high-momentum (hard) gluons and the low-momentum (soft) mean color-field that is induced by the collective motion of the hard particles. From the exact field-equations of motion of QCD, a self-consistent set of approximate quantum-kinetic equations are derived by separating hard and soft dynamics and choosing a convenient axial-type gauge. This set of master equations describes the momentum space evolution of the individual hard quanta, the space-time development of the ensemble of hard gluons, and the generation of the soft mean-field by the current of the hard particles. The quantum-kinetic equations are approximately solved to order g~2 (1+gA) for a specific example, namely the scenario of a high-energy gluon beam along the lightcone, demonstrating the practical applicability of the approach.- 12.38.Aw
- 11.10.Wx
- 12.38.Mh
- quantum chromodynamics: short-range
- quantum chromodynamics: long-range
- critical phenomena
- gluon: density
- gluon: hadronization
- gluon: beam
- gluon: propagator
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