Abstract
In this paper, the one-loop CHY-integrands of bi-adjoint scalar theory has been reinvestigated. Differing from previous constructions, we have explicitly removed contributions from tadpole and massless bubbles when taking the forward limit of corresponding tree-level amplitudes. The way to remove those singular contributions is to exploit the idea of “picking poles”, which is to multiply a special cross ratio factor with the role of isolating terms having a particular pole structure.
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Feng, B., Hu, C. One-loop CHY-integrand of bi-adjoint scalar theory. J. High Energ. Phys. 2020, 187 (2020). https://doi.org/10.1007/JHEP02(2020)187
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DOI: https://doi.org/10.1007/JHEP02(2020)187