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Renormalization in an interpolating gauge in Yang-Mills theory

The Coulomb gauge in QCD is the only explicitly unitary gauge. But it suffers from energy-divergences which means that it is not rigorously well-defined. One way to define it unambiguously is as the limit of a gauge interpolating between the Feynman gauge and the Coulomb gauge. This interpolating gauge is characterized by a parameter theta and the Coulomb gauge is obtained in the limit theta tends to 0. We study the renormalization of this theta-gauge for all values of theta. Novel features include field mixing as well as scaling, the renormalization of the theta parameter itself, and the appearance of new counter-term structures at two-loop order.

preprint2020arXivOpen access

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