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Induced top-Yukawa coupling and suppressed Higgs mass parameters

Tatsuo Kobayashi*

Hiroaki Nakano†

Haruhiko Terao‡

  • Department of Physics, Kyoto University, Kyoto 606-8502, Japan

  • Department of Physics, Niigata University, Niigata 950-2181, Japan

  • Institute for Theoretical Physics, Kanazawa University, Kanazawa 920-1192, Japan

  • *Electronic address: kobayash@gauge.scphys.kyoto-u.ac.jp
  • †Electronic address: nakano@muse.sc.niigata-u.ac.jp
  • ‡Electronic address: terao@hep.s.kanazawa-u.ac.jp
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Phys. Rev. D 71, 115009 – Published 21 June, 2005

DOI: https://doi.org/10.1103/PhysRevD.71.115009

Abstract

In the scenarios with heavy top squarks, mass parameters of the Higgs field must be fine-tuned due to a large logarithmic correction to the soft scalar mass. We consider a new possibility that the top-Yukawa coupling is small above TeV scale. The large top mass is induced from strong Yukawa interaction of the Higgs with another gauge sector, in which supersymmetry breaking parameters are given to be small. Then it is found that the logarithmic correction to the Higgs soft scalar mass is suppressed in spite of the strong coupling, and the fine-tuning is ameliorated. We propose an explicit model coupled to a superconformal gauge theory which realizes the above situation.

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Phys. Rev. D 71, 115009– Published 21 June, 2005
  • Received 1 February 2005

© 2005 American Physical Society

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