Abstract
We make an explicit link between the cubic interactions of off-shell fields and the on-shell three-point amplitudes in four dimensions. Both the cubic interactions and the on-shell three-point amplitudes had been independently classified in the literature, but their relation has not been made explicit. The aim of this note is to provide such a relation and discuss similarities and differences of their constructions. For the completeness of our analysis, we also derive the covariant form of all parity-odd massless vertices.
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Conde, E., Joung, E. & Mkrtchyan, K. Spinor-helicity three-point amplitudes from local cubic interactions. J. High Energ. Phys. 2016, 40 (2016). https://doi.org/10.1007/JHEP08(2016)040
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DOI: https://doi.org/10.1007/JHEP08(2016)040