Construction and Consequences of Coloured Charges in QCD

Details Construction and Consequences of Coloured Charges in QCD Construction and Consequences of Coloured Charges in QCD

1997-06-27

arxiv.org/abs/hep-ph/9706521v1

Published in the proceedings of the workshop on Quantum Chromodynamics: Collisions, Confinement and Chaos, Editors H.M. Fried

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, latex, needs sprocl.sty

Scientific paper

This talk reports on work aimed at improving our understanding of charged states in gauge theories.Emphasis is placed on different ways of implementingthe gauge invariance of physical states. QED perturbative calculations are used to stress that gauge invariance is not enough: only a subset of such states have a direct physical significance. In QCD a non-perturbative obstruction means that quarks and gluons cannot form physical states and as such these particles are not truely observables. This sets a fundamental limit on the constituent quark model.

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