Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-09-08
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, no figures; the version accepted for publication in Physical Review
Scientific paper
We reanalyze the W-boson loop in the amplitude of the Higgs 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 survive in this limit and generates a nonvanishing contribution in the $H\to \gamma\gamma$ 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.
Shifman Michael
Vainshtein Alek
Voloshin Mikhail B.
Zakharov Valentin
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