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First, we will show how the notion of clothing in quantum field theory (QFT), put forward by Greenberg and Schweber and developed by M. I. Shirokov, can be employed not only in the theory of interacting meson and nucleon fields (see, e.g., our previous works ), but in quantum electrodynamics (QED) and, perhaps, in quantum chromodynamics (QCD) too. As before, using the instant form of relativistic dynamics and applying the method of unitary clothing transformations (shortly, UCT method) we have derived a novel analytic expression for the QED Hamiltonian in the clothed-particle representation (CPR) in which the so-called bad terms are simultaneously removed from Hamiltonian and boosts via one and the same UCT. In spite of the primary electromagnetic (EM) interaction has been chosen in the Coulomb gauge (CG) with an apparent violation of the Lorentz invariance the latter is restored owing to the cancellation of the noncovariant Coulomb interaction contribution already with the first clothing transformation. A similar cancellation has been found by us in case of the vector mesons (spin 1 bosons) interacting via the Yukawa-type couplings with the nucleons (spin 1/2 fermions). Second, we are trying to realize this notion in quantum chromodynamics (QCD) (to be definite for the gauge group SU(3)) when drawing parallels between QCD and QED. It is convenient to do it along the guideline: the well-known QCD Lagrangian density with the hermitean and traceless vector potentials, the mass and covariant derivative matrices in color space, the color-Maxwell equations and color gauge-invariant energy-momentum stress tensor versus their colorless counterparts in QED.

Clothed particles in mesodynamics, quantum electrodynamics and other field models