Renormalization of the pseudoscalar operator at four loops in QCD
Abstract
We present the renormalization constant of the pseudoscalar operator defined with a non-anticommuting γ5 in dimensional regularization up to four-loop order in perturbative Quantum Chromodynamics (QCD). Furthermore, by virtue of renormalization-group invariance of the relation between the scalar and the pseudoscalar operator, we predict the MS factor of the renormalization constant for the latter at five-loop order in QCD.
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