On the role of the subsidiary fields in the momentum and angular momentum in covariantly quantized QED and QCD
Abstract
The covariant quantization of QED and QCD requires the introduction of subsidiary gauge-fixing and ghost fields and it is crucial to understand the role of these in the energy-momentum tensor, and in the momentum and angular momentum operators. These issues were studied in Leader:2011za, and key results from this study were utilized in the major review of angular momentum in Leader:2013jra. Damski Damski:2021feu has rightly criticized as incorrect the derivation of certain equations in Leader:2011za. We show, however, that the key results of Leader:2011za which are utilized in Leader:2013jra are unaffected by Damski's criticism.
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