Gomez, HumbertoLopez-Arcos, CristhiamTalavera, Pedro2019-07-082019-07-082017-10-0111266708https://repositorio.usc.edu.co/handle/20.500.12421/276In this paper we reconsider the Cachazo-He-Yuan construction (CHY) of the so called scattering amplitudes at one-loop, in order to obtain quadratic propagators. In theories with colour ordering the key ingredient is the redefinition of the Parke-Taylor factors. After classifying all the possible one-loop CHY-integrands we conjecture a new one-loop amplitude for the massless Bi-adjoint Φ3 theory. The prescription directly reproduces the quadratic propagators of the traditional Feynman approach. © 2017, The Author(s).enDifferential and Algebraic GeometryScattering AmplitudesSuperstrings and Heterotic StringsArticle