Abstract
The two-loop corrections to the three-vector-boson vertices are calculated in the limit of large Higgs mass. Corrections growing quadratically with the Higgs mass appear in the anomalous magnetic moment of the charged vector boson and the corresponding W 0W +W − coupling. Also the weak coupling constant in the W 0W +W − vertex receives a correction compared to the coupling in μ-decay. The results suggest a breakdown of perturbation theory for a Higgs mass of 3.4 TeV and larger.
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