The $\beta$-function of supersymmetric theories from vacuum supergraphs: a three-loop example

Abstract

We verify a method which allows to obtain the $\beta$-function of supersymmetric theories regularized by higher covariant derivatives by calculating only specially modified vacuum supergraphs. With the help of this method for a general renormalizable $\mathcal{N}=1$ supersymmetric gauge theory a part of the three-loop $\beta$-function depending on the Yukawa couplings is constructed in the general $\xi$-gauge. The result is written in the form of an integral of double total derivatives with respect to the loop momenta. It is demonstrated that all gauge dependent terms cancel each other in agreement with the general statements. Taking into account that the result in the Feynman gauge (found earlier) coincides with the one obtained by the standard technique, this fact confirms the correctness of the considered method by a highly nontrivial multiloop calculation.

arXiv comment10 pages, 1 figure

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• The four-loop $\beta$-function from vacuum supergraphs and the NSVZ relation for $\mathcal{N}=1$ SQED regularized by higher derivatives
• Quantum properties of gauge theories with extended supersymmetry formulated in $\mathcal{N}=1$ superspace