Application of a coordinate-space method for the evaluation of lattice Feynman diagrams in two dimensions Original Research Article

We apply a new coordinate-space method for the evaluation of lattice Feynman diagrams suggested by Lüscher and Weisz to field theories in two dimensions. Our work is presented for the theories with massless propagators. The main idea is to deal with the integrals in position space by making use of the recursion relation for the free propagator G(x) which allows us to compute the propagator recursively by its values around the origin. It turns out that the method is very efficient and gives very precise results. We illustrate the technique by evaluating a number of two- and three-loop diagrams explicitly.