A NEW METHOD OF CALCULATING MASSIVE FEYNMAN DIAGRAMS - VERTEX-TYPE FUNCTIONS

We extend the recently invented method of calculating massive Feynman integrals, namely the differential equations method, to vertex-type diagrams. As an example, for calculations of one-and two-loop diagrams we show that by analogy with propagator-type diagrams this method is a simple procedure for evaluating the result without calculating D-space integrals (for dimensional regularization).