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《中国物理C》（英文）编辑部
2024年10月30日
Chinese Physics C> 2018, Vol. 42> Issue(12) : 123107 DOI: 10.1088/1674-1137/42/12/123107

Probing top-quark couplings indirectly at Higgs factories

  • 1.

      DESY Notkestraß

  • 2.

      PRISMA Cluster of Excellence, Institut fü

  • 3.

      Theoretical Physics Department, CERN, 1211 Geneva 23, Switzerland

  • 4.

      Institute of High Energy Physics, and School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

  • We perform a global effective-field-theory analysis to assess the combined precision of Higgs couplings, triple gauge-boson couplings, and top-quark couplings, at future circular e+e- colliders, with a focus on runs below the tt production threshold. Deviations in the top-quark sector entering as one-loop corrections are consistently taken into account in the Higgs and diboson processes. We find that future lepton colliders running at center-of-mass energies below the tt production threshold can still provide useful information on top-quark couplings, by measuring virtual top-quark effects. With rate and differential measurements, the indirect individual sensitivity achievable is better than at the high-luminosity LHC. However, strong correlations between the extracted top-quark and Higgs couplings are also present and lead to much weaker global constraints on top-quark couplings. This implies that a direct probe of top-quark couplings above the tt production threshold is also helpful for the determination of Higgs and triple-gauge-boson couplings. In addition, we find that below the e+e-→tth production threshold, the top-quark Yukawa coupling can be determined by its loop corrections to all Higgs production and decay channels. Degeneracy with the ggh coupling can be resolved, and even a global limit is competitive with the prospects of a linear collider above the threshold. This provides an additional means of determining the top-quark Yukawa coupling indirectly at lepton colliders.
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  • References

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Gauthier Durieux, Jiayin Gu, Eleni Vryonidou and Cen Zhang. Probing top-quark couplings indirectly at Higgs factories[J]. Chinese Physics C, 2018, 42(12): 123107. doi: 10.1088/1674-1137/42/12/123107
Gauthier Durieux, Jiayin Gu, Eleni Vryonidou and Cen Zhang. Probing top-quark couplings indirectly at Higgs factories[J]. Chinese Physics C, 2018, 42(12): 123107.  doi: 10.1088/1674-1137/42/12/123107 shu
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Received: 2018-08-21
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    CZ is supported by IHEP (Y7515540U1)

    EV is supported by a Marie Sklodowska-Curie Individual Fellowship of the European Commission's Horizon 2020 Programme (704187)

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Probing top-quark couplings indirectly at Higgs factories

    Corresponding author: Gauthier Durieux,
    Corresponding author: Jiayin Gu,
    Corresponding author: Eleni Vryonidou,
    Corresponding author: Cen Zhang,
  • 1.  DESY Notkestraß
  • 2.  PRISMA Cluster of Excellence, Institut fü
  • 3.  Theoretical Physics Department, CERN, 1211 Geneva 23, Switzerland
  • 4.  Institute of High Energy Physics, and School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received Date: 2018-08-21
  • Available Online: 2018-12-05
Fund Project:  CZ is supported by IHEP (Y7515540U1) EV is supported by a Marie Sklodowska-Curie Individual Fellowship of the European Commission's Horizon 2020 Programme (704187)

Abstract: We perform a global effective-field-theory analysis to assess the combined precision of Higgs couplings, triple gauge-boson couplings, and top-quark couplings, at future circular e+e- colliders, with a focus on runs below the tt production threshold. Deviations in the top-quark sector entering as one-loop corrections are consistently taken into account in the Higgs and diboson processes. We find that future lepton colliders running at center-of-mass energies below the tt production threshold can still provide useful information on top-quark couplings, by measuring virtual top-quark effects. With rate and differential measurements, the indirect individual sensitivity achievable is better than at the high-luminosity LHC. However, strong correlations between the extracted top-quark and Higgs couplings are also present and lead to much weaker global constraints on top-quark couplings. This implies that a direct probe of top-quark couplings above the tt production threshold is also helpful for the determination of Higgs and triple-gauge-boson couplings. In addition, we find that below the e+e-→tth production threshold, the top-quark Yukawa coupling can be determined by its loop corrections to all Higgs production and decay channels. Degeneracy with the ggh coupling can be resolved, and even a global limit is competitive with the prospects of a linear collider above the threshold. This provides an additional means of determining the top-quark Yukawa coupling indirectly at lepton colliders.

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