QCD Green functions in a gluon field

Details QCD Green functions in a gluon field QCD Green functions in a gluon field

2004-10-15

arxiv.org/abs/hep-ph/0410235v3

JHEP0412:051,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, 7 figures. Minor modifications in text. Version to be published in JHEP

Scientific paper

10.1088/1126-6708/2004/12/051

We formulate a dressed perturbative expansion of QCD, where the standard diagrams are evaluated in the presence of a constant external gluon field whose magnitude is gaussian distributed. The approach is Poincar{\'e} and gauge invariant, and modifies the usual results for hard processes only by power suppressed contributions. Long distance propagation of quarks and gluons turns out to be inhibited due to a branch point singularity instead of a pole at $p^2=0$ in the quark and gluon propagators. The dressing keeps the (massless) quarks in q qbar fluctuations of the photon at a finite distance from each other.

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