Physical charges in QED and QCD

Details Physical charges in QED and QCD Physical charges in QED and QCD

2009-10-28

arxiv.org/abs/0910.5395v2

PoS (QCD-TNT09):019,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk given at the International Workshop on QCD Green's Functions, Confinement and Phenomenology, September 7-11 2009, ECT Tre

Scientific paper

We show that the `dressing' approach, which describes physical charges as gauge invariant composites of matter and clouds of gauge bosons, arises naturally in gauge theories. We give perturbative examples of dressings for both asymptotic charges and for states in which the fields are confined to a compact volume as is required, for example, by causality in pair creation. In QCD, we use dressed states to demonstrate explicitly how Gribov copies obstruct the non-perturbative construction of colour charges.

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