  We examine multiphoton production in the electroweak sector of the Standard
Model in the high energy limit using the equivalence theorem in combination
with spinor helicity techniques. We obtain recursion relations for currents
consisting of a charged scalar, spinor, or vector line that radiates $n$
photons. Closed form solutions to these recursion relations for arbitrary $n$
are presented for the cases of like-helicity and one unlike-helicity photon
production. We apply the currents singly and in pairs to obtain amplitudes for
processes involving the production of $n$ photons with up to two unlike
helicities from a pair of charged particles. The replacement of one or more
photons by transversely polarized $$Z$-bosons is also discussed.

High Energy Physics - Phenomenology