Renormalized $\epsilon$-finite master integrals and their virtues: the three-loop self energy case

Abstract

Loop diagram calculations typically rely on reduction to a finite set of master integrals in $4-2\epsilon$ dimensions. It has been shown that for any problem, the masters can be chosen so that their coefficients are finite as $\epsilon \to 0$. I propose a definition of renormalized $\epsilon$-finite master integrals, which incorporate ultraviolet divergence subtractions in a specific way. A key advantage of this choice is that in expressions for physical observables, expansions to positive powers in $\epsilon$ are never needed. As an example, I provide the subtractions for general three-loop self-energy integrals. The differential equations method is used to compute numerically the renormalized $\epsilon$-finite master integrals for arbitrary external momentum invariant, in special cases with internal masses equal to a single scale or zero. These include the ones necessary for the three-loop QCD corrections to the self-energies of the W, Z, and Higgs bosons. In principle, the same method should provide for numerical computation of general three-loop self energies with any masses.

arXiv comment33 pages. v2 includes one additional even threshold topology

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Cited by in corpus (4)

• Three-loop QCD corrections to the electroweak boson masses
• Evaluation of three-loop self-energy master integrals with four or five propagators
• Analytic and numerical approaches for depictive 3-loop integrals using sector decomposition
• Higgs Boson Mass Corrections at Three-Loops in the Top-Yukawa Sector of the Standard Model