Abstract
The rare Higgs boson decay H → Zγ is forbidden at tree-level. In the Standard Model, it is loop-mediated through a W boson or a heavy quark. We analytically compute the QCD correction to the heavy quark loop, confirming earlier purely numerical results, that were obtained for on-shell renormalization. The small quark mass expansion of the decay matrix element contains only single-logarithmic contributions at each perturbative order, which is in contrast to the double logarithms observed in H → γγ. We investigate the numerical interplay of bottom and top quark contributions, and the dependence of the result on the renormalization scheme.
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Gehrmann, T., Guns, S. & Kara, D. The rare decay H → Zγ in perturbative QCD. J. High Energ. Phys. 2015, 38 (2015). https://doi.org/10.1007/JHEP09(2015)038
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DOI: https://doi.org/10.1007/JHEP09(2015)038