Higgs-boson decay into two photons as a probe of anomalous gauge couplings

We present the results of a calculation on the influence of anomalous $\gamma \mathrm{WW}$ and $\gamma \gamma \mathrm{WW}$ gauge-boson couplings on the decay of the Higgs boson into two photons. In the standard model this decay occurs via penguin diagrams with scalars, fermions, and $W$ bosons within the loop. We show that if new physics comes in at the scale of 1 TeV, anomalous gauge couplings can lead to a large enhancement or suppression of the decay rate compared to the standard-model results depending on the parameter ${\lambda }_{\gamma }$ and ${\kappa }_{\gamma }$ in the $\gamma \mathrm{WW}$ and $\gamma \gamma \mathrm{WW}$ coupling.