Higgs boson decay into two photons through the W-boson loop: No decoupling in the m W→0 limit

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Abstract

We reanalyze the W-boson loop in the amplitude of the Higgs boson decay into two photons to show the absence of decoupling in the limit of massless W bosons, m W→0. The Higgs coupling to longitudinal polarizations survives in this limit and generates a nonvanishing contribution in the H→γγ decay. This shows that the recent claim of decoupling by R. Gastmans, S.L. Wu, and T.T. Wu is incorrect, and the old calculations for the two-photon decay well known in the literature are valid.

Original languageEnglish (US)
Article number013015
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume85
Issue number1
DOIs
StatePublished - Jan 20 2012

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