Higgs Decay into Two Photons, Revisited

Details Higgs Decay into Two Photons, Revisited Higgs Decay into Two Photons, Revisited

2011-08-30

arxiv.org/abs/1108.5872v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 2 figures

Scientific paper

The one-loop calculation of the amplitude for the Higgs decay H-->\gamma\gamma\ due to virtual W's in the unitary gauge is presented. As the Higgs does not directly couple to the massless photons, the one-loop amplitude is finite. The calculation is performed in a straightforward way, without encountering divergences. In particular, artifacts like dimensional regularization are avoided. This is achieved by judiciously routing the external momenta through the loop and by combining the integrands of the amplitudes before carrying out the integration over the loop momentum. The present result satisfies the decoupling theorem for infinite Higgs mass, and is thus different from the earlier results obtained in the \xi=1 gauge using dimensional regularization. The difference between the results is traced to the use of dimensional regularization.

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