Anomalous couplings of vector bosons and the decay $H \longrightarrow γγ$: Dimensional regularization versus momentum cutoff

Abstract

As an illustration of general principles, the $W$-boson loop contribution to the amplitude for the decay $H\to γγ$ is calculated within a specific model for the effective lagrangian describing the anomalous gauge boson couplings. Different approaches to the dependence of the result on the scale of new physics $Λ$ are briefly discussed.