Recursion relations for tree amplitudes in super gauge theories

Abstract

Using newly proposed recursion relations in [25, 26], compact formulas are obtained for tree-level amplitudes of g1-g 2-g3-g4+g 5+...gn+. We then make an extension of these recursion relations to include fermions of multi-flavors, from which MHV and MHV amplitudes are reproduced. We also calculate non-MHV amplitudes of processes with two fermions and four gluons. Results thus obtained are equivalent to those obtained by extended CSW prescriptions, and those by conventional field theory calculations. © SISSA/ISAS 2005.