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Cusp and collinear anomalous dimensions in four-loop QCD from form factors

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arxiv 2002.04617 v2 pith:IAJU6FTF submitted 2020-02-11 hep-ph hep-th

Cusp and collinear anomalous dimensions in four-loop QCD from form factors

classification hep-ph hep-th
keywords anomalousdimensionsfour-loopgluonintegralsquarkbasiscollinear
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We calculate the complete quark and gluon cusp anomalous dimensions in four-loop massless QCD analytically from first principles. In addition, we determine the complete matter dependence of the quark and gluon collinear anomalous dimensions. Our approach is to Laurent expand four-loop quark and gluon form factors in the parameter of dimensional regularization. We employ finite field and syzygy techniques to reduce the relevant Feynman integrals to a basis of finite integrals, and subsequently evaluate the basis integrals directly from their standard parametric representations.

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