Abstract
We apply the on-shell tree-level recursion relations of
Britto, Cachazo, Feng and Witten to a variety of processes involving
internal and external massive particles with spin. We show how to
construct multi-vector boson currents where one or more off-shell
vector bosons couples to a quark pair and number of gluons. We give
compact results for single vector boson currents with up to six
partons and double vector boson currents with up to four partons for
all helicity combinations. We also provide expressions for single
vector boson currents with a quark pair and an arbitrary number of
gluons for some specific helicity configurations. Finally, we show
how to generalise the recursion relations to handle massive
particles with spin on internal lines using gg→t
as an
example.
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