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<p>We estimate the magnitude of the leading <i>non-perturbative</i> QCD corrections to the decays of the Higgs boson to the <i>γZ</i> and <i>γγ</i> final states. These corrections originate from the light-quark contributions to such decays. We show that the non-perturbative effects are suppressed by the small Yukawa couplings of light quarks, but that there is no further quark-mass suppression. This is at variance with what is found in the standard perturbative calculations of the light-quark contributions. We demonstrate that the non-perturbative corrections modify the <i>H</i> → <i>γZ</i> and <i>H</i> → <i>γγ</i> decay rates by <InlineEquation ID="IEq1"> <EquationSource Format="MATHML"><math display="inline"> <mi mathvariant="script">O</mi> <mfenced close=")" open="("> <msup> <mn>10</mn> <mrow> <mo>−</mo> <mn>5</mn> </mrow> </msup> </mfenced> </math></EquationSource> <EquationSource Format="TEX">\( \mathcal{O}\left({10}^{-5}\right) \)</EquationSource> </InlineEquation>, well below the expected precision with which such decays can be studied both at the high-luminosity LHC and at future colliders.</p>

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Non-perturbative effects in Higgs boson decays to electroweak vector bosons and photons

  • 期刊论文

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  • 发表日期：

    2026年3月18日

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  • Alexander Khodjamirian,
  • Kirill Melnikov,
  • Arkady Vainshtein

摘要

We estimate the magnitude of the leading non-perturbative QCD corrections to the decays of the Higgs boson to the γZ and γγ final states. These corrections originate from the light-quark contributions to such decays. We show that the non-perturbative effects are suppressed by the small Yukawa couplings of light quarks, but that there is no further quark-mass suppression. This is at variance with what is found in the standard perturbative calculations of the light-quark contributions. We demonstrate that the non-perturbative corrections modify the H → γZ and H → γγ decay rates by O 10 − 5 \( \mathcal{O}\left({10}^{-5}\right) \) , well below the expected precision with which such decays can be studied both at the high-luminosity LHC and at future colliders.