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<p>We examine the potential of the LHC to observe the scalar radial excitation present in extensions of the standard model where the Higgs boson is a pseudo Nambu Golstone boson. These include composite Higgs models as well as the twin Higgs model. These states can be light enough to be seen at the LHC, potentially resulting in additional clues about the nature of the Higgs sector. We present the current status of LHC bounds as well as the future prospects for the high luminosity LHC (HL-LHC). We identify the most sensitive channels as those where the radial state decays to a pair of Higgs bosons, especially at the high luminosity stage. For the minimal composite Higgs models we study, we make use of the LHC Run 2 data with <InlineEquation ID="IEq1"> <EquationSource Format="MATHML"><math display="inline"> <mi mathvariant="script">L</mi> </math></EquationSource> <EquationSource Format="TEX">\( \mathcal{L} \)</EquationSource> </InlineEquation> = 138 fb<sup>−1</sup> to extract the 2<i>σ</i> mass bounds <i>m</i><sub><i>σ</i></sub> ≥ (0.93−1.13) TeV, where the values on the interval depend on the parameters of the model. We show that the reach of the HL-LHC for these cases is <i>m</i><sub><i>σ</i></sub> ≥ (1.8–2.2) TeV, with <InlineEquation ID="IEq2"> <EquationSource Format="MATHML"><math display="inline"> <mi mathvariant="script">L</mi> </math></EquationSource> <EquationSource Format="TEX">\( \mathcal{L} \)</EquationSource> </InlineEquation> = 3000 fb<sup>−1</sup>. For the twin Higgs model radial state, the current bounds are set by Higgs coupling measurements, while for the HL-LHC we obtain the reach <i>m</i><sub><i>σ</i></sub> ≥ 1<i>.</i>2 TeV, corresponding to the lowest symmetry breaking scale allowed by current data.</p>

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The radial mode of composite Higgs theories at the LHC

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月25日

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  • Gustavo Burdman,
  • Marvin M. Janini,
  • Lincoln Pereira,
  • Murilo Trevisan

摘要

We examine the potential of the LHC to observe the scalar radial excitation present in extensions of the standard model where the Higgs boson is a pseudo Nambu Golstone boson. These include composite Higgs models as well as the twin Higgs model. These states can be light enough to be seen at the LHC, potentially resulting in additional clues about the nature of the Higgs sector. We present the current status of LHC bounds as well as the future prospects for the high luminosity LHC (HL-LHC). We identify the most sensitive channels as those where the radial state decays to a pair of Higgs bosons, especially at the high luminosity stage. For the minimal composite Higgs models we study, we make use of the LHC Run 2 data with L \( \mathcal{L} \) = 138 fb−1 to extract the 2σ mass bounds mσ ≥ (0.93−1.13) TeV, where the values on the interval depend on the parameters of the model. We show that the reach of the HL-LHC for these cases is mσ ≥ (1.8–2.2) TeV, with L \( \mathcal{L} \) = 3000 fb−1. For the twin Higgs model radial state, the current bounds are set by Higgs coupling measurements, while for the HL-LHC we obtain the reach mσ ≥ 1.2 TeV, corresponding to the lowest symmetry breaking scale allowed by current data.