Abstract
We develop a method for investigating the asymptotic behaviour of vertex functions at certain Minkowskian exceptional momenta. It is a direct generalization of earlier treatments of Euclidean exceptional momenta. It makes use of formal expansions in momentum space, closely related to light-cone expansions in position space. Our expansions have to be performed in those channels which carry finite total momentum squared and admit (in A4-theory) two-particle intermediate states.
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