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Effective field theory approach to parton-hadron conversion in high energy QCD processes

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-p...

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Autor principal: Kinder-Geiger, Klaus
Lenguaje:eng
Publicado: 1994
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.51.3669
http://cds.cern.ch/record/268587
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author Kinder-Geiger, Klaus
author_facet Kinder-Geiger, Klaus
author_sort Kinder-Geiger, Klaus
collection CERN
description 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.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1994
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spelling cern-2685872019-09-30T06:29:59Zdoi:10.1103/PhysRevD.51.3669http://cds.cern.ch/record/268587engKinder-Geiger, KlausEffective field theory approach to parton-hadron conversion in high energy QCD processesParticle Physics - TheoryA 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.hep-ph/9409308CERN-TH-7440-94oai:cds.cern.ch:2685871994-09-14
spellingShingle Particle Physics - Theory
Kinder-Geiger, Klaus
Effective field theory approach to parton-hadron conversion in high energy QCD processes
title Effective field theory approach to parton-hadron conversion in high energy QCD processes
title_full Effective field theory approach to parton-hadron conversion in high energy QCD processes
title_fullStr Effective field theory approach to parton-hadron conversion in high energy QCD processes
title_full_unstemmed Effective field theory approach to parton-hadron conversion in high energy QCD processes
title_short Effective field theory approach to parton-hadron conversion in high energy QCD processes
title_sort effective field theory approach to parton-hadron conversion in high energy qcd processes
topic Particle Physics - Theory
url https://dx.doi.org/10.1103/PhysRevD.51.3669
http://cds.cern.ch/record/268587
work_keys_str_mv AT kindergeigerklaus effectivefieldtheoryapproachtopartonhadronconversioninhighenergyqcdprocesses