2011/08/30 by R. Gastmans, S. L. Wu, Sau Lan Wu +4 · 1 citation
Physics and Astronomy · #Cosmology and Gravitation Theories #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #Pulsars and Gravitational Waves Research #hep-ph
paper · pdf · doi:10.48550/arxiv.1108.5872
20 pages, 2 figures
arxiv created 2011/08/30 · openalex publication_date 2011/08/30 · arxiv updated 2011/08/31 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The one-loop calculation of the amplitude for the Higgs decay H-->γγ 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 ξ=1 gauge using dimensional regularization. The difference between the results is traced to the use of dimensional regularization.