Cancellation of energy divergences in Coulomb gauge QCD
“Rudjer Bošković” Institute, Zagreb, Croatia
2 Department of Applied Mathematics and Theoretical Physics, University of Cambridge, UK
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In the Coulomb gauge of non-abelian gauge theories there are in general, in individual graphs, “energy divergences” on integrating over the loop energy variable for fixed loop momentum. These divergences are avoided in the Hamiltonian, phase-space formulation. But, even in this formulation, energy divergences re-appear at 2-loop order. We show in an example how these cancel between graphs as a consequence of the Ward identities.
© Springer-Verlag, 2005