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<p>We study the decay of a heavy CP-even neutral Higgs into an on-shell Standard Model-like Higgs boson and two photons, <i>H</i> → <i>hγγ</i>, in the two-Higgs doublet model. We argue that the decay channel <i>H</i> → <i>hγγ</i>, followed by the decay of the Standard Model Higgs <InlineEquation ID="IEq2"> <EquationSource Format="MATHML"><math display="inline"> <mi>h</mi> <mo>→</mo> <mi>b</mi> <mover accent="true"> <mi>b</mi> <mo stretchy="true">¯</mo> </mover> </math></EquationSource> <EquationSource Format="TEX">\( h\to b\overline{b} \)</EquationSource> </InlineEquation>, could be observed at the 5<i>σ</i> level at the High-Luminosity LHC for masses of the heavy Higgs up to 950 GeV for the type-II, 650 GeV for the Lepton Specific and the Flipped 2HDMs, and 350 GeV for the type-I. We also discuss the possible role of the decay <i>H</i> → <i>hγγ</i> in discriminating among different types of 2HDMs and in enhancing the total number of events in the final state <InlineEquation ID="IEq3"> <EquationSource Format="MATHML"><math display="inline"> <mi>H</mi> <mo>→</mo> <mi>b</mi> <mover accent="true"> <mi>b</mi> <mo stretchy="true">¯</mo> </mover> <mi mathvariant="italic">γγ</mi> </math></EquationSource> <EquationSource Format="TEX">\( H\to b\overline{b}\gamma \gamma \)</EquationSource> </InlineEquation> compared to the cascade decay <i>H</i> → <i>hh</i> followed by <i>h</i> → <i>γγ h</i> → <InlineEquation ID="IEq4"> <EquationSource Format="MATHML"><math display="inline"> <mi>b</mi> <mover accent="true"> <mi>b</mi> <mo stretchy="true">¯</mo> </mover> </math></EquationSource> <EquationSource Format="TEX">\( b\overline{b} \)</EquationSource> </InlineEquation> with identical final state (although with different kinematical distributions).</p>

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Prospects for detecting the rare heavy Higgs decay H → hγγ through the \( H\to b\overline{b}\gamma \gamma \) channel at the LHC

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  • 发表日期：

    2025年7月8日

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  • M. A. Arroyo-Ureña,
  • Alejandro Ibarra,
  • Pablo Roig,
  • T. Valencia-Pérez

摘要

We study the decay of a heavy CP-even neutral Higgs into an on-shell Standard Model-like Higgs boson and two photons, H → hγγ, in the two-Higgs doublet model. We argue that the decay channel H → hγγ, followed by the decay of the Standard Model Higgs h → b b ¯ \( h\to b\overline{b} \) , could be observed at the 5σ level at the High-Luminosity LHC for masses of the heavy Higgs up to 950 GeV for the type-II, 650 GeV for the Lepton Specific and the Flipped 2HDMs, and 350 GeV for the type-I. We also discuss the possible role of the decay H → hγγ in discriminating among different types of 2HDMs and in enhancing the total number of events in the final state H → b b ¯ γγ \( H\to b\overline{b}\gamma \gamma \) compared to the cascade decay H → hh followed by h → γγ h → b b ¯ \( b\overline{b} \) with identical final state (although with different kinematical distributions).