Abstract
The theorem stating the absence of localized charged physical states in QED is extended to QCD in the manifestly covariant canonical formalism. The correct relation between the Gupta-Bleuler condition and the coherent photon states associated to the charged sectors is clarified in the case of QED, which secures the existence of electrons as non-localized charged physical states.
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Ojima, I., Hata, H. Observables and quark confinement in the covariant canonical formalism of Yang-Mills theory II. Z. Phys. C - Particles and Fields 1, 405–412 (1979). https://doi.org/10.1007/BF01546980
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DOI: https://doi.org/10.1007/BF01546980