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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.
      PCAS:
    • 13.66.Fg(Gauge and Higgs boson production in e?e+ interactions)
    • 14.65.Ha(Top quarks)
    • 14.80.Bn(Standard-model Higgs bosons)

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    [2] S. Chatrchyan et al (CMS), Phys. Lett. B, 716:30 (2012), arXiv:1207.7235[hep-ex]
    [3] J. Ellis and T. You, JHEP, 03:089 (2016), arXiv:1510.04561 [hep-ph]
    [4] J. Ellis, P. Roloff, V. Sanz, and T. You, JHEP, 05:096 (2017), arXiv:1701.04804[hep-ph]
    [5] G. Durieux, C. Grojean, J. Gu, and K. Wang, JHEP, 09:014 (2017), arXiv:1704.02333[hep-ph]
    [6] T. Barklow, K. Fujii, S. Jung, R. Karl, J. List, T. Ogawa, M. E. Peskin, and J. Tian, Phys. Rev. D, 97:053003 (2018), arXiv:1708.08912[hep-ph]
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    [24] W. Buchmuller and D. Wyler, Nucl. Phys. B, 268:621 (1986)
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    [36] D. Kreimer, The Role of 5 in dimensional regularization, (1993), arXiv:hep-ph/9401354
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    [65] W. A. Bardeen and B. Zumino, Nucl. Phys. B, 244:421 (1984)

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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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