期刊
PHYSICAL REVIEW D
卷 79, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.79.094015
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资金
- National Science Foundation [PHY-0354776, PHY-0354822, PHY-0653342]
- US LHC Theory Initiative through NSF [0653342]
- Direct For Mathematical & Physical Scien
- Division Of Physics [705682] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [0653342] Funding Source: National Science Foundation
We study two-loop anomalous dimension matrices in QCD and related gauge theories for products of Wilson lines coupled at a point. We verify by an analysis in Euclidean space that the contributions to these matrices from diagrams that link three massive Wilson lines do not vanish in general. We show, however, that for two-to-two processes the two-loop anomalous dimension matrix is diagonal in the same color-exchange basis as the one-loop matrix for arbitrary masses at absolute threshold and for scattering at 90 degrees in the center of mass. This result is important for applications of threshold resummation in heavy quark production.
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