The two-loop energy–momentum tensor within the gradient-flow formalism
The two-loop energy–momentum tensor within the gradient-flow formalism
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DOI：
10.1140/epjc/s10052-018-6415-7
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发表时间：
2018-08
期刊：
影响因子：
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通讯作者：
R. Harlander;Yannick Kluth;Fabian Lange
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文献类型：
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作者：
R. Harlander;Yannick Kluth;Fabian Lange
将QCD能量动量张量的梯度流公式推广到NNLO微扰理论。这意味着威尔逊系数乘以相应的表达式中的流动算子的正规能量动量张量计算到这个顺序。结果已经通过应用现代工具的经常扰动理论，减少发生的两个回路积分，其中还包括流时间积分，一个小的主积分，可以计算分析。
The gradient-flow formulation of the energy–momentum tensor of QCD is extended to NNLO perturbation theory. This means that the Wilson coefficients which multiply the flowed operators in the corresponding expression for the regular energy–momentum tensor are calculated to this order. The result has been obtained by applying modern tools of regular perturbation theory, reducing the occurring two-loop integrals, which also include flow-time integrations, to a small set of master integrals which can be calculated analytically.