Effective Field Theory Approach to Parton-Hadron Conversion in High Energy QCD Processes

Abstract

A QCD based effective action is constructed to describe the dynamics of confinement and symmetry breaking in the process of parton-hadron conversion. The deconfined quark and gluon degrees of freedom of the perturbative QCD vacuum are coupled to color singlet collective fields representing the non-perturbative vacuum with broken scale and chiral symmetry. The effective action recovers QCD with its scale and chiral symmetry properties at short space-time distances, but yields at large distances (r > 1 fm) to the formation of symmetry breaking gluon and quark condensates. The approach is applied to the evolution of a fragmenting $q\bar{q}$ pair with its generated gluon distribution, starting from a large hard scale $Q^2$. The modification of the gluon distribution arising from the coupling to the non-perturbative collective field results eventually in a complete condensation of gluons. Color flux tube configurations of the gluons in between the $q\bar{q}$ pair are obtained as solutions of the equations of motion. With reasonable parameter choice, the associated energy per unit length (string tension) comes out $\simeq 1$ GeV/fm, consistent with common estimates.

CERN-TH. 7440/94, 34 pages, 10 figures, Latex file plus figures encoded with uufiles

References in corpus (4)

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Cited by in corpus (10)

• Effective Action for the Quark-Meson Model
• Physics and Signatures of the Quark - Gluon Plasma
• REAL-TIME DESCRIPTION OF PARTON-HADRON CONVERSION AND CONFINEMENT DYNAMICS
• Non-equilibrium QCD: Interplay of hard and soft dynamics in high-energy multi-gluon beams
• Inclusive Particle Spectra at RHIC
• Homogeneous nucleation of quark-gluon plasma, finite size effects and long-lived metastable objects
• Dynamical fragmentation of flux tubes in the Friedberg-Lee model
• Cronin Effect and High Transver Momentum Suppression in D+Au Collisions
• Suppression of High Transverse Momentum ${\pi }^0$ Spectra in Au+Au Collisions at RHIC
• Instanton-inspired Model of QCD Phase Transition and Bubble Dynamics