Higgs Amplitudes From Twistor Inspired Methods

We illustrate the use of new on-shell methods, 4-dimensional unitarity cuts combined with on-shell recursions relations, by computing the A_4^{(1)}(phi,1^-,2^-,3^+,4^+) amplitude in the large top mass limit where the Higgs boson couples to gluons through an effective interaction.
Comment: 4 pages, two figures, based on talks given at the Cracow Epiphany Conference on Precision Physics and Monte Carlos for LHC 4 - 6 January 2007, Cracow, Poland and the 42nd Rencontres de Moriond QCD and High Energy Hadronic Interactions, March 17-24, La Thuile, Italy