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.
Rather than computing S matrix elements between usual states of the Fock space
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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.