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<p>The measurement of the Higgs self-coupling is considered the next milestone in the study of the Higgs boson properties. At future <i>e</i><sup>+</sup><i>e</i><sup>−</sup> facilities below the double Higgs production threshold, this is extracted from the <i>Zh</i> production cross-section, which is sensitive to the trilinear coupling at the one-loop level. At the same perturbative order, potential effects beyond the Standard Model (SM) may affect the Higgstrahlung rate and distort the self-coupling determination. We study the question focusing especially on contact interactions containing two electron and two top-quark fields. We conclude that, in the context of FCC-ee and its planned runs at different energies, <i>eett</i> interactions change the Higgs self-coupling sensitivity below the percent level. Even in the most pessimistic scenarios, we confirm a robust sensitivity of the order of 17% at the 1<i>σ</i> confidence level under the assumption of otherwise SM-like Higgs couplings. A crucial role in these results is played by the measurement of fermion pair production above the <i>Z</i> resonance.</p>

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Could electron-top interactions spoil the measurement of the Higgs trilinear? A quantitative estimate at future lepton colliders

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月15日

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  • Lukas Allwicher,
  • Christophe Grojean,
  • Lucine Tabatt

摘要

The measurement of the Higgs self-coupling is considered the next milestone in the study of the Higgs boson properties. At future e+e− facilities below the double Higgs production threshold, this is extracted from the Zh production cross-section, which is sensitive to the trilinear coupling at the one-loop level. At the same perturbative order, potential effects beyond the Standard Model (SM) may affect the Higgstrahlung rate and distort the self-coupling determination. We study the question focusing especially on contact interactions containing two electron and two top-quark fields. We conclude that, in the context of FCC-ee and its planned runs at different energies, eett interactions change the Higgs self-coupling sensitivity below the percent level. Even in the most pessimistic scenarios, we confirm a robust sensitivity of the order of 17% at the 1σ confidence level under the assumption of otherwise SM-like Higgs couplings. A crucial role in these results is played by the measurement of fermion pair production above the Z resonance.