Higgs Decay to Two Photons

William J. Marciano, Cen Zhang, Scott Willenbrock

Published 2011-09-24, updated 2011-10-12Version 2

The amplitude for Higgs decay to two photons is calculated in renormalizable and unitary gauges using dimensional regularization at intermediate steps. The result is finite, gauge independent, and in agreement with previously published results. The large Higgs mass limit is examined using the Goldstone-boson equivalence theorem as a check on the use of dimensional regularization and to explain the absence of decoupling.