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The cross-section for ZZ->ZZ with arbitrarily polarized Z bosons iscalculated within the electroweak Standard Model including the completeO(alpha) corrections. We show the numerical importance of the radiativecorrections and elaborate its characteristic features. The treatment of theHiggs-boson resonance is discussed in different schemes including theS-matrix-motivated pole scheme and the background-field method. The numericalaccuracy of the equivalence theorem is investigated by comparing thecross-sections for purely longitudinal Z bosons obtained from the equivalencetheorem and from the complete calculation. In this context the full O(alpha)corrections are also confronted with the enhanced corrections of O(alphaM_H^2/s_w^2 M_W^2), which were frequently used in the literature.Comment: 35 pages LaTeX, 19 postscript figures include

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Radiative corrections to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ZZ</mml:mi><mml:mo>→</mml:mo><mml:mi>ZZ</mml:mi></mml:math>in the electroweak standard model

Radiative corrections toZZ→ZZin the electroweak standard model