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arXiv · 1703.04714

Quadratic Feynman Loop Integrands From Massless Scattering Equations

Humberto Gomez
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Abstract

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.

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Humberto Gomez. 2017-03-14. Quadratic Feynman Loop Integrands From Massless Scattering Equations. https://doi.org/10.1103/physrevd.95.106006

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