Regular Article - Theoretical Physics
The two-loop energy–momentum tensor within the gradient-flow formalism
Institute for Theoretical Particle Physics and Cosmology, RWTH Aachen University, 52056, Aachen, Germany
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Accepted: 1 November 2018
Published online: 17 November 2018
The gradient-flow formulation of the energy–momentum tensor of QCD is extended to NNLO perturbation theory. This means that the Wilson coefficients which multiply the flowed operators in the corresponding expression for the regular energy–momentum tensor are calculated to this order. The result has been obtained by applying modern tools of regular perturbation theory, reducing the occurring two-loop integrals, which also include flow-time integrations, to a small set of master integrals which can be calculated analytically.
© The Author(s), 2018