Third-order NSF operators for definite helicities generate the graviton exchange amplitude 16πG s³/(tu) for (+,- → +,-) scattering from a single Wick contraction, with finite angular integrals over S².
Quantum graviton scattering with definite helici- ties in the null surface formulation. Part III: Fourth-order scattering and the complete tree-level graviton-graviton amplitude
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Quantum graviton scattering with definite helicities in the null surface formulation, Part II: Third-order scattering and the exchange channels \author{C.~N.~Kozameh \and G.~O.~Depaola}
Third-order NSF operators for definite helicities generate the graviton exchange amplitude 16πG s³/(tu) for (+,- → +,-) scattering from a single Wick contraction, with finite angular integrals over S².