arXiv:hep-th/0610309·v1·High Energy Physics — Theory
The box diagram in Yukawa theory
Bernard L. G. Bakker🇳🇱 · Jorn K. Boomsma (Department of Physics and Astrophysics, Vrije Universiteit)🇳🇱 · Chueng-Ryong Ji (Department of Physics, North Carolina State University)🇺🇸
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.
Comments: 21 pages, 17 figures. submittes to Phys. Rev. D