# SOME ANALYTIC PROPERTIES OF THE VERTEX FUNCTION

@article{Oehme1960SOMEAP, title={SOME ANALYTIC PROPERTIES OF THE VERTEX FUNCTION}, author={R. Oehme}, journal={Physical Review}, year={1960}, volume={117}, pages={1151-1159} }

The absorptive part of the vertex function F[k , 2 p ' 2 (k .. p) ] is an analytic function of the mass variables 2 2 k and p On the basis of causality and the spectral conditions, the region of regularity D(cr) of the absorptive ( 2 2 2) part A k , p , o is obtained for fixed values of o ~ c • The boundary of D(o) is calculated explicitly for the case k = p , which is of interest in connection with form factors. By the use of examples based upon perturb~tion theory, it is shown that this… CONTINUE READING

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