Abstract
The usual formalism for non-Abelian gauge theories is not completely satisfactory. Calculations show that the usual formalism for Weinberg's unified gauge theory with a bilinear gauge condition leads to violation of unitarity, contrary to general formal proofs of unitarity. In contrast, the Lagrange multiplier formalism for this theory gives rise to unitary amplitudes; their unitarity was checked explicitly at the 1-loop and the 2-loop levels. This shows the general validity of the Lagrange multiplier formalism and its advantages over the usual formalism. (auth)
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