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arXiv 1603.04801hep-th
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${\cal N}=1$超对称理论中$V\bar cc$ -顶点的非重整化

Non-renormalization of the $V\bar cc$-vertices in ${\cal N}=1$ supersymmetric theories

K. V. Stepanyantz

摘要:

利用Slavnov-Taylor恒等式,证明了在${\cal N}=1$超对称规范理论中,量子规范超场的三点鬼点在所有圈中都不是重整化的.这一说法是验证了明确的单循环计算的帮助下,BRST不变版本的高阶协变导数正则化。利用所考虑的顶点的非重整化对重整化常数的限制,我们用Faddeev-Popov鬼和量子规范超场的反常维数来表示精确的NSVZ $β$ -函数。在用这种方法得到的NSVZ $β$函数的表达式中,Faddeev-Popov鬼场和物质超场的贡献具有相同的结构。

英文摘要:

Using the Slavnov--Taylor identities we prove that the three-point ghost vertices with a single line of the quantum gauge superfield are not renormalized in all loops in ${\cal N}=1$ supersymmetric gauge theories. This statement is verified by the explicit one-loop calculation made by the help of the BRST invariant version of the higher covariant derivative regularization. Using the restrictions to the renormalization constants which are imposed by the non-renormalization of the considered vertices we express the exact NSVZ $β$-function in terms of the anomalous dimensions of the Faddeev--Popov ghosts and of the quantum gauge superfield. In the expression for the NSVZ $β$-function obtained in this way the contributions of the Faddeev--Popov ghosts and of the matter superfields have the same structure.

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