Unitary clothing transformations yield momentum-independent second-order fermion mass shifts due to vector boson exchange without mass counterterms in the S-matrix for nucleon-rho and electron-photon models.
Thus, only explicitly co- variant terms will enter the S operator, that ensures UF (Λ)SU − 1 F (Λ) = S and the property ( 49)
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Clothed particle representation in quantum field theory: Fermion mass renormalization due to vector boson exchange
Unitary clothing transformations yield momentum-independent second-order fermion mass shifts due to vector boson exchange without mass counterterms in the S-matrix for nucleon-rho and electron-photon models.