  Since the photon has no mass, it does not couple directly to the Higgs
particle. This implies that the one-loop correction to the decay H -->
\gamma\gamma\ is necessarily finite. Therefore, this correction should be
calculable without introducing either regularization or ghosts. Such a
calculation is carried out in this paper for the case of one W loop. The result
obtained this way turns out not to agree with the previous, well-known one, and
it is argued that the present result is to be preferred because it satisfies
the decoupling theorem. The discrepancy can be traced to the use of dimensional
regularization in the previous result.
