The equivalence theorem and its radiative correction-free formulation for all R_#xi# gauges

The electroweak equivalence theorem quantitatively connects the physical amplitudes of longitudinal massive gauge bosons to those of the corresponding unphysical would-be Goldstone bosons. Its precise form depends on both the gauge fixing condition and the renormalization scheme. Our previous modification-free schemes have applied to a broad class of R_#epsilon#-gauges including 't Hooft-Feynman gauge but excluding Landau gauge. In this paper we construct a new renormalization scheme in which the multiplicative radiative modification factor, C"a_m_o_d, is equal to unity for all R_#epsilon#-gauges, including both 't Hooft-Feynman and Landau gauges. This scheme makes C"a_m_o_d equal to unity by specifying a convenient subtraction condition for the would-be Goldstone boson wavefunction renormalization constant Z_#phi#_"a. We build the new scheme for both the standard model and the effective Lagrangian formulated electroweak theories (with either linearly or non-linearly realized symmetry breaking sector). Based upon these, a new prescription, called ''divided equivalence theorem'', is further proposed for extending the high energy region applicable to the equivalence theorem. (orig.)Available from TIB Hannover: RA 2999(96-079) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman