Physical charges in QED and QCD
Abstract
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 pertur-bative 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. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial- ShareAlike Licence.
Description
Talk given at the International Workshop on QCD Green's Functions,
Confinement and Phenomenology, September 7-11 2009, ECT Trento, Italy. 8
pages, 3 pdf figures. V2: references added, to appear in PoS
Collections
Publisher
Sissa Medialab
Journal
Proceedings of International Workshop on QCD Green’s Functions, Confinement and Phenomenology — PoS(QCD-TNT09)
Volume
09
Pagination
019-
Author URL
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