2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/179828We 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.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, ItalyHigh Energy Physics - Phenomenologytext