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arXiv 1902.08602hep-thhep-ph
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降维正则化的${\cal N}=1$ SQCD的三圈Adler $D$ -函数

The three-loop Adler $D$-function for ${\cal N}=1$ SQCD regularized by dimensional reduction

S. S. Aleshin, A. L. Kataev, K. V. Stepanyantz

摘要:

从最近用高阶协变导数正则化得到的三圈结果开始计算$\overline{\mbox{DR}}$方案中${\cal N}=1$ SQCD的三圈Adler $D$ -函数。为此,对于高阶导数正则化的理论,我们找到了一个减法方案,其中的格林函数与降维和修正的最小减法处方得到的SQCD耦合常数和物质超场的重整化相一致。我们还计算了$\overline{\mbox{DR}}$方案中所有重整化常数的$D$函数(包括由于SQCD修正而出现的电磁耦合常数)。结果表明,这些结果不满足将$D$函数与物质超场的反常维数联系起来的NSVZ类方程。然而,NSVZ类方案可以构造的帮助下,适当调整有限重整化。它也表明,三圈$D$ -功能定义的裸耦合与降维不满足NSVZ方程的任意重整化处方。我们还调查了一种可能性,目前的结果的形式的$β$ -扩展和该扩展方案的依赖性。

英文摘要:

The three-loop Adler $D$-function for ${\cal N}=1$ SQCD in the $\overline{\mbox{DR}}$ scheme is calculated starting from the three-loop result recently obtained with the higher covariant derivative regularization. For this purpose, for the theory regularized by higher derivatives we find a subtraction scheme in which the Green functions coincide with the ones obtained with the dimensional reduction and the modified minimal subtraction prescription for the renormalization of the SQCD coupling constant and of the matter superfields. Also we calculate the $D$-function in the $\overline{\mbox{DR}}$ scheme for all renormalization constants (including the one for the electromagnetic coupling constant which appears due to the SQCD corrections). It is shown that the results do not satisfy the NSVZ-like equation relating the $D$-function to the anomalous dimension of the matter superfields. However, the NSVZ-like scheme can be constructed with the help of a properly tuned finite renormalization. It is also demonstrated that the three-loop $D$-function defined in terms of the bare couplings with the dimensional reduction does not satisfy the NSVZ-like equation for an arbitrary renormalization prescription. We also investigate a possibility to present the results in the form of the $β$-expansion and the scheme dependence of this expansion.

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