Symbolic calculation of multiparticle Feynman amplitudes

Abstract

Using the newly modified method developed for symbolic evaluation of Feynman amplitudes we examine two processes $2\to 2$ (including a case of Majorana fermions) at a tree level. Constructing special polarization basis for spinor particles, we obtain compact expressions for helicity amplitudes. We present the regular way for simplification of evaluated symbolic expressions.

Comments: 8 pages, LaTeX, axodraw.sty