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2017

Quadratic Feynman Loop Integrands From Massless Scattering Equations

Gomez, Humberto

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Recently the Cachazo-He-Yuan (CHY) approach has been extended to loop level, but the resulting loop integrand has propagators that are linear in the loop momentum unlike Feynman's.

In this note we present a new technique that directly produces quadratic propagators identical to Feynman's from the CHY approach.
This paper focuses on $\Phi^3$ theory but extensions to others theories are briefly discussed.
In addition, our proposal has an interesting geometric meaning, we can interpret this new formula as a unitary cut on a higher genus Riemann surface.

Quadratic Feynman Loop Integrands From Massless Scattering Equations · Around

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