Quadratic Feynman loop integrands from massless scattering equations

H Gomez - Physical Review D, 2017 - APS
Physical Review D, 2017APS
Recently, the Cachazo-He-Yuan (CHY) approach has been extended to the loop level, but
the resulting loop integrand has propagators that are linear in the loop momentum unlike
Feynman's. In this paper, we present a new technique that directly produces quadratic
propagators identical to Feynman's from the CHY approach. This paper focuses on the Φ 3
theory, but extensions to other 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 …
Recently, the Cachazo-He-Yuan (CHY) approach has been extended to the loop level, but the resulting loop integrand has propagators that are linear in the loop momentum unlike Feynman’s. In this paper, we present a new technique that directly produces quadratic propagators identical to Feynman’s from the CHY approach. This paper focuses on the theory, but extensions to other 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.
American Physical Society
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