Equivalence theorem and its radiative-correction-free formulation for all R{sub {xi}} gauges
- Theory Division, Deutsches Elektronen-Synchrotron DESY, D-22603 Hamburg (Germany)
- Department of Theoretical Physics, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510 (United States)
The electroweak equivalence theorem quantitatively connects the physical amplitudes of longitudinal massive gauge bosons to those of the corresponding {ital 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{sub {xi}} gauges including the `t Hooft{endash}Feynman gauge but excluding the Landau gauge. In this paper we construct a new renormalization scheme in which the radiative modification factor C{sub mod}{sup a} is equal to unity for all R{sub {xi}} gauges, including both `t Hooft{endash}Feynman and Landau gauges. This scheme makes C{sub mod}{sup a} equal to unity by specifying a convenient subtraction condition for the would-be Goldstone boson wave function renormalization constant Z{sub {phi}{sup a}}. We build the new scheme for both the standard model and the effective Lagrangian formulated electroweak theories (with either linearly or nonlinearly realized symmetry-breaking sector). Based upon these, a new prescription, called the {open_quotes}divided equivalence theorem,{close_quotes} is further proposed for extending the high energy region applicable to the equivalence theorem. {copyright} {ital 1997} {ital The American Physical Society}
- Research Organization:
- Fermi National Accelerator Laboratory
- DOE Contract Number:
- AC02-76CH03000
- OSTI ID:
- 450554
- Journal Information:
- Physical Review, D, Vol. 55, Issue 3; Other Information: PBD: Feb 1997
- Country of Publication:
- United States
- Language:
- English
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