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B. Henning and T. Melia, Constructing effective field theories via their harmonics , Phys. Rev. D100
Original
1902
Earlier work this paper cites.
B. Henning and T. Melia, Conformal-helicity duality & the Hilbert space of free CFTs , arXiv:1902.06747 [hep-th]
Original
1902
Earlier work this paper cites.
T. Ma, J. Shu, and M.-L. Xiao, Standard Model Effective Field Theory from On-shell Amplitudes , arXiv:1902.06752 [hep-ph]
Original
1902
Earlier work this paper cites.
R. Aoude and C. S. Machado, The Rise of SMEFT On-shell Amplitudes , JHEP 12
Original
1905
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Original
1909
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Original
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Original
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Original
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Then

E. Conde and A. Marzolla, Lorentz Constraints on Massive Three-Point Amplitudes , JHEP 09
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2016
Later among the works it cites.
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2020

Constructing massive on-shell contact terms

Durieux, Gauthier, Kitahara, Teppei, Machado, Camila S. et al.

Understand

The purely on-shell approach to effective field theories requires the construction of independent contact terms.

Employing the little-group-covariant massive-spinor formalism, we present the first systematic derivation of independent four-point contact terms involving massive scalars, spin-1/2 fermions, and vectors.
Independent three-point amplitudes are also listed for massive particles up to spin-3.
We make extensive use of the simple relations between massless and massive amplitudes in this formalism.