无粲强子B衰变中的NNLO顶点修正：虚部
NNLO Vertex Corrections in charmless hadronic B decays: Imaginary part
摘要：
我们在QCD因式分解框架下计算了强子二体衰变的2圈顶点修正的虚部B -> pi pi。这完成了拓扑树振幅虚部的NNLO计算，并代表了QCD因式分解中直接CP不对称性的NNLO预测的重要一步。关于技术方面，我们发现，软共线红外发散取消硬散射内核，这表明因式分解在2圈顺序。所有的结果得到解析，包括依赖于粲夸克质量。数值的NNLO校正的影响被认为是显着的，特别是它们导致增强的强相位的颜色抑制树振幅。
英文摘要：
We compute the imaginary part of the 2-loop vertex corrections in the QCD Factorization framework for hadronic two-body decays as B -> pi pi. This completes the NNLO calculation of the imaginary part of the topological tree amplitudes and represents an important step towards a NNLO prediction of direct CP asymmetries in QCD Factorization. Concerning the technical aspects, we find that soft and collinear infrared divergences cancel in the hard-scattering kernels which demonstrates factorization at the 2-loop order. All results are obtained analytically including the dependence on the charm quark mass. The numerical impact of the NNLO corrections is found to be significant, in particular they lead to an enhancement of the strong phase of the colour-suppressed tree amplitude.
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