Calculation of the one W loop H→γγ decay amplitude with a lattice regulator

Francis Bursa, Aleksey Cherman, Thomas C. Hammant, Ron R. Horgan, Matthew Wingate

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


There has been a recent controversial claim that the standard result on the Higgs to two photon decay rate is incorrect, with the use of dimensional regularization fingered as the alleged culprit. Given the great importance of the H→γγ process as a possible standard model Higgs discovery channel at the LHC if the Higgs mass is light, it is critical to find a way to check the correctness of the results of dimensional regularization for this process. Here we report the results of a perturbative calculation of the H→γγ decay amplitude using a spacetime lattice as a UV regulator, which is the only known gauge-invariant regulator for non-Abelian gauge theories other than dimensional regularization. We find that the decay amplitude calculated using lattice-regularized perturbation theory is consistent to very high statistical accuracy with the decay amplitude obtained using dimensional regularization.

Original languageEnglish (US)
Article number093009
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number9
StatePublished - May 15 2012
Externally publishedYes


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