Further on the current algebra of WZNW models at and away from criticality
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We comment on the off-critical perturbations of WZNW models by a mass term as well as by another descendent operator, when we can compare the results with further algebra obtained from the Dirac quantization of the model, in such a way that a more general class of models be included. We discover, in both cases, hidden Kac-Moody algebras obeyed by some currents in the off-critical case, which in several cases are enough to completely fix the correlation functions.
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Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, v. 317, n. 1-2, p. 78-81, 1993.
