Abstract
A polynomial form is established for the off-shell CHY scattering equations proposed by Lam and Yao. Re-expressing this in terms of independent Mandelstam invariants provides a new expression for the polynomial scattering equations, immediately valid off shell, which makes it evident that they yield the off-shell amplitudes given by massless 𝜙3 Feynman graphs. A CHY expression for individual Feynman graphs, valid even off shell, is established through a recurrence relation.
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Dolan, L., Goddard, P. Off-shell CHY amplitudes and Feynman graphs. J. High Energ. Phys. 2020, 141 (2020). https://doi.org/10.1007/JHEP04(2020)141
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DOI: https://doi.org/10.1007/JHEP04(2020)141