Master integrals for massless three-loop form factors: One-loop and two-loop insertions

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• 作者：T. Gehrmann ; G. Heinrich ; T. Huber and C. Studerus
• 刊名：Physics Letters B
• 出版年：2006
• 期刊代码：58_03702693
• 类别：ph
• 出版时间：21 September 2006
• 卷：640
• 期：5-6
• 页码：252-259
• 文件大小：148 K

摘要

The three-loop form factors in massless QCD can be expressed as a linear combination of master integrals. Besides a number of master integrals which factorise into products of one-loop and two-loop integrals, one finds 16 genuine three-loop integrals. Of these, six have the form of a bubble insertion inside a one-loop or two-loop vertex integral. We compute all master integrals with these insertion topologies.