1,846 research outputs found
The vacuum preserving Lie algebra of a classical W-algebra
We simplify and generalize an argument due to Bowcock and Watts showing that
one can associate a finite Lie algebra (the `classical vacuum preserving
algebra') containing the M\"obius subalgebra to any classical
\W-algebra. Our construction is based on a kinematical analysis of the
Poisson brackets of quasi-primary fields. In the case of the \W_\S^\G-algebra
constructed through the Drinfeld-Sokolov reduction based on an arbitrary
subalgebra of a simple Lie algebra \G, we exhibit a natural
isomorphism between this finite Lie algebra and \G whereby the M\"obius
is identified with .Comment: 11 pages, BONN-HE-93-25, DIAS-STP-93-13. Some typos had been removed,
no change in formula
Non-invariant two-loop counterterms for the three-gauge-boson vertices
Some practical applications of algebraic renormalization are discussed. In
particular we consider the two-loop QCD corrections to the three-gauge-boson
vertices involving photons, Z and W bosons. For this purpose also the
corresponding two-point functions have to be discussed. A recently developed
procedure is used to analyze the breaking terms of the functional identities
and explicit formulae for the universal counterterms are provided. Special
attention is devoted to the treatment of infra-red divergences.Comment: Some minor corrections and improved discussion in the one-loop
sectio
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