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The box diagram in Yukawa theory

Bernard L. G. Bakker, Jorn K. Boomsma, Chueng-Ryong Ji

hep-tharXiv:hep-th/0610309

Abstract

We present a light-front calculation of the box diagram in Yukawa theory. The covariant box diagram is finite for the case of spin-1/2 constituents exchanging spin-0 particles. In light-front dynamics, however, individual time-ordered diagrams are divergent. We analyze the corresponding light-front singularities and show the equivalence between the light-front and covariant results by taming the singularities.

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