The Adler $D$-function for ${\cal N}=1$ SQCD regularized by higher covariant derivatives in the three-loop approximation

TL;DR

This paper computes the three-loop Adler D-function for ${ m extbf{N=1}}$ SQCD using higher covariant derivatives, verifies an all-order relation with anomalous dimensions, and constructs a special renormalization scheme for consistent results.

Contribution

It extends the all-order relation between the Adler D-function and anomalous dimensions to arbitrary representations and verifies it at three loops, introducing a scheme where this relation holds for renormalized quantities.

Findings

Explicit three-loop expression for the Adler D-function in ${ m extbf{N=1}}$ SQCD.

Verification of the all-order relation at three loops.

Construction of a renormalization scheme preserving the relation for renormalized quantities.

Abstract

We calculate the Adler $D$-function for ${\cal N}=1$ SQCD in the three-loop approximation using the higher covariant derivative regularization and the NSVZ-like subtraction scheme. The recently formulated all-order relation between the Adler function and the anomalous dimension of the matter superfields defined in terms of the bare coupling constant is first considered and generalized to the case of an arbitrary representation for the chiral matter superfields. The correctness of this all-order relation is explicitly verified at the three-loop level. The special renormalization scheme in which this all-order relation remains valid for the $D$-function and the anomalous dimension defined in terms of the renormalized coupling constant is constructed in the case of using the higher derivative regularization. The analytic expression for the Adler function for ${\cal N}=1$ SQCD is found in this scheme to the order $O(\alpha_s^2)$. The problem of scheme-dependence of the $D$-function and the NSVZ-like equation is briefly discussed.