We illustrate the use of new on-shell methods, 4-dimensional unitarity cuts combined with on-shell recursions relations by computing the A4(1) (\phi ,1-,2-,3+,4+) amplitude in the large top mass limit where the Higgs boson couples to gluons through an effective interaction.
PACS numbers: 12.38.Bx, 14.80.Bn, 11.15.Bt, 11.55.Bq
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