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  • Open Access

Systematic approach to ℓ-loop planar integrands from the classical equation of motion

Yi-Xiao Tao*

  • *Contact author: taoyx21@mails.tsinghua.edu.cn
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Phys. Rev. D 112, 106002 – Published 10 November, 2025

DOI: https://doi.org/10.1103/qtpc-16j6

Abstract

In this paper, we present a recursive method for ℓ-loop planar integrands in colored quantum field theories. We start with the classical equation of motion and then pick out the comb component, which will help us to define the loop kernels. Then we construct the ℓ-loop integrands based on some recursion rules for the ℓ-loop kernels. Finally, we reach a recursion formula for the ℓ-loop planar integrands. Our method can be easily generalized to general quantum field theories, even non-Lagrangian theories, to obtain the planar part of the whole ℓ-loop integrands.

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Phys. Rev. D 112, 106002– Published 10 November, 2025
  • Received 29 April 2025
  • Accepted 16 October 2025
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