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arXiv 1009.4302hep-ph
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R_xi规范和幺正规范中电弱单圈振幅有理数部分的Feynman定则

Feynman rules for the rational part of the Electroweak 1-loop amplitudes in the R_xi gauge and in the Unitary gauge

M. V. Garzelli, I. Malamos, R. Pittau

摘要:

本文给出了在电弱标准模型中进行单圈计算所需的R_2类有理项的费曼规则的完整集合。我们的公式是在R_xi规范和酉规范中给出的,从而完善了在't Hooft-Feynman规范中已有的结果。作为一致性检查,我们验证了在过程H -> gamma gamma的情况下以及在其他一些物理情况下,总有理部分R_1+R_2对所选规范的独立性。此外,我们还明确地检验了在1圈幺正规范的定义中,圈动量积分前后极限xi ->无穷大的等价性。

英文摘要:

We present the complete set of Feynman rules producing the rational terms of kind R_2 needed to perform any 1-loop calculation in the Electroweak Standard Model. Our formulae are given both in the R_xi gauge and in the Unitary gauge, therefore completing the results in the 't Hooft-Feynman gauge already presented in a previous publication. As a consistency check, we verified, in the case of the process H -> gamma gamma and in a few other physical cases, the independence of the total Rational Part R_1+R_2 on the chosen gauge. In addition, we explicitly checked the equivalence of the limits xi -> infinity after or before the loop momentum integration in the definition of the Unitary gauge at 1-loop.

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