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Amplitude bases in generic EFTs
Stefano De Angelis
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We present for the first time an efficient algorithm to find a basis of kinematically independent structures built of (massless and massive) spinor helicity variables in four dimensions. This method provides a classification of independent contact terms for the scattering amplitudes with generic masses, spins and multiplicity, in any effective field theory (EFT). These contact terms are in one-to-one correspondence with a complete set of irrelevant operators in the EFT. As basic applications of our method, we classify the D²ⁿ F⁴ contact terms in SU$(N)$ Yang-Mills theory for n≤8, dimension-six operators involving five W^±, Z and γ vector bosons, and spin-tidal effective interactions for spin-1 massive particles in gravitational theories.
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