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MHV amplitudes are not a method. They are amplitudes. Second, if I remember correctly, its not true, except in supersymmetric theories, that the other amplitudes M(all +'s) and M(all + and one -) vanish. At tree level they vanish, but I think even if you look at the original Parke Taylor paper, they write an O(g^4) contribution. Jacob2718 (talk) 07:18, 25 September 2008 (UTC)