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arXiv 1602.03161hep-phhep-th
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BCJ恒等式与$d$维广义酉性

BCJ Identities and $d$-Dimensional Generalized Unitarity

Amedeo Primo, William J. Torres Bobadilla

摘要:

我们提出了一组尺寸调节QCD振幅的单圈积分系数之间的关系。在维正则化,颜色运动学的对偶性和被积函数减少的组合使用产生的部分振幅与外部粒子的不同顺序的被积函数的残留物之间的关系的存在。这些关系可以建立的削减建设的贡献,以及负责合理的条款。从一般的参数化的单圈残留和应用洛朗展开,以提取主积分的振幅分解的系数,我们表明,通过考虑d维树水平之间的BCJ身份,可以得到一套完整的关系。我们提供了明确的例子,多胶子散射振幅在一个圈。

英文摘要:

We present a set of relations between one-loop integral coefficients for dimensionally regulated QCD amplitudes. Within dimensional regularization, the combined use of color-kinematics duality and integrand reduction yields the existence of relations between the integrand residues of partial amplitudes with different orderings of the external particles. These relations can be established for the cut-constructible contributions as well for the ones responsible for rational terms. Starting from the general parametrization of one-loop residues and applying Laurent expansion in order to extract the coefficients of the amplitude decomposition in terms of master integrals, we show that the full set of relations can be obtained by considering BCJ identities between d-dimensional tree-levels. We provide explicit examples for multi-gluon scattering amplitudes at one-loop.

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