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arXiv · 2503.02079

Ladders and rainbows in Minimal Subtraction

Paul-Hermann Balduf
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Abstract

In dimensional regularization with $D=D_0-2\epsilon$, the minimal subtraction (MS) scheme is characterized by counterterms that only consist of singular terms in $\epsilon$. We develop a general method to compute the infinite sums of massless ladder or rainbow Feynman integrals in MS at $D_0$. Our method is based on relating the MS-solution to a kinematic solution at a coupling-dependent renormalization point. If the $\epsilon$-dependent Mellin transform of the kernel diagram of the insertions can be computed in closed form, we typically obtain a closed form expression for the all-order solution in MS. As examples, we consider Yukawa theory and $\phi^4$ theory in $D_0=4$, and $\phi^3$ theory in $D_0=6$.

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Paul-Hermann Balduf. 2025-03-03. Ladders and rainbows in Minimal Subtraction. https://doi.org/10.1103/kxln-26db

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