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Study of supersymmetric unified theory based on superstring theory

Research Project

Project/Area Number 08640362
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionKanazawa University

Principal Investigator

SUEMATSU Daijiro  Kanazawa University, Department of Physics, Associate Professor, 理学部, 助教授 (90206384)

Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1997: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1996: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsSuperstring / Supersymmetry / Unified theory
Research Abstract

Phenomenological features of effective supersymmetric models derived as the low energy effective theory of superstring have been studied from various points of view. Main results obtained in this project are followings.
1. Models with an extra U (1) symmetry and a gauge singlet field can solve a mu-problem in the minimal supersymmetric standard model (MSSM). In this kind of models a neutralino sector is extended by an extra U (1) gaugino and a fermion partner of the singlet scalar. There can appear typical examples are decays of neutralinos, an electric dipole moment of an electron and mu*egamma. We have analyzed these processes taking account of a kinetic term mixing of U (1) gauginos and shown that there could be substantial differences from the MSSM results.
2. We can realize small neutrino masses under a suitable condition in the models with an extra U (1). In this type of models group theoretical constraints on Yukawa couplings are not so strong and then a neutrino mass matrix can h … More ave a largely different structure from the one of usual grand unified models. Under assumptions of the existence of three right-handed neutrinos and mixings between a very heavy right-handed neutrino and other light neutrinos, we have constructed a phenomenological neutrino mass matrix. We have shown that in this model both deficits of solar and atmospheric neutrinos and the dark matter problem could be explained. We have also analyzed the relation of this model to the primordial nucleosynthesis and other neutrino oscillation experiments.
3. In order to know whether the models with an extra U (1) can solve the mu-problem or not, we need to analyze the existence of the parameter region which satisfys both constraints from prescise measurements of the electroweak interaction and the radiative symmetry breaking at the electroweak scale. We have studied this subject taking account of an effect of the kinetic term mixing among U (1) gauge fields and shown that we could find such an parameter region. Less

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] Daijiro Suematsu: "Flavor structure of soft SUSY-breaking parameters" Phys.Rev.D. 54-9. 5715-5722 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Daijiro Suematsu: "Neutrino oscillation based on the mitings with a heavy right-handed neutrino" Phys.Lett.B. 392. 413-418 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Daijiro Suematsu: "Effect on the electron EDM dueto abelian gaugino in SUSY extra U(1)models" Mod.Phys.Lett.A. 12. 1709-1718 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Daijiro Suematsu: "μ→eγ in supersymmetric multi U(1) models with an abelian gaugins mixing" Phys.Lett.B. 416. 108-116 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Daijiro Suematsu: "Neutralino decay in the μ-problem solvable extra U(1) models" Phys.Rev.D. 57-3. 1738-1754 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Daijiro Suematsu: "Phenomenological neutrino massmatrix for neutrino oscillations and dark matter" Prog.Theor.Phys.99-3. (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Daijiro Suematsu: "Proton Stability and Small Neutrino Mass in String Inspired E_6 Models" Prog.Theor.Phys.96-3. 611-622 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Daijiro Suematsu: "Flavor structure of soft SUSY-breaking parameters" Phys.Rev.D54-9. 5715-5722 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Daijiro Suematsu: "Neutrino oscillation based on the mixings with a heavy right-handed neutrino" Phys.Lett.B392. 413-418 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Daijiro Suematsu: "Effect on the electron EDM due to abelian gaugino in SUSY extra U (1) models" Mod.Phys.Lett.A12. 1709-1718 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Daijiro Suematsu: "mu*egamma in supersummetric multi U (1) models with an abelian gaugino mixing" Phys.Lett.B416. 108-116 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Daijiro Suematsu: "Neutralino decay in the mu-problem solvable extra U (1) models" Phys.Rev.D57-3. 1738-1754 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Daijiro Suematsu: "Phenomenological neutrino mass matrix for neutrino oscillations and dark matter" Prog.Theor.Phys.99-3. (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Daijiro Suematsu: "Effect on the electron EDM due to Abelian gaugins in SUSY extra U(1) models" Modern Physics Letters A. 12・23. 1709-1718 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Daijiro Suematsu: "μ→eγ in supersymmetric multi U(1)models with an abelian gangino mixing" Physics Letters B. 416. 108-116 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Daijiro Suematsu: "Neutralino decay in the μ-problem solvable extra U(1) models" Physical Review D. 57・3. 1738-1754 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Daijiro Suematsu: "Phenomenological neutrino mass matrix for neutrins oscillations and dark matter" Progress of theoretical Physics. 93・3. (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Daijiro Suematsu: "Proton Stability and Small Neutrino Massin String Inspired E Models" Progress of Theoretical Physics. 96・3. 611-622 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Daijiro Suematsu: "Flavor structure of soft SUSY-breaking parameters" Physical Review D. 54・9. 5715-5722 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Daijiro Suematsu: "Neutrino Oscillation based on the Mixings with a Heavy Right-Hanaled Neutrino" Physics Letters B. (1997)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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