1996 Fiscal Year Final Research Report Summary
The analysis of the rare decay processes of B-meson and the verification of new physics beyond the standard model
| Project/Area Number |
06640386
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
素粒子・核・宇宙線
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| Research Institution | Aichi University OF Education |
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Principal Investigator |
MATSUDA Masahisa Aichi Univ.of Education, Professor, 教育学部, 教授 (30111868)
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| Co-Investigator(Kenkyū-buntansha) |
USHIDA Noriyuki Aichi Univ.of Education, Professor, 文学部, 教授 (70024049)
HAYASHI Takemi Koggakan University, Professor, 文学部, 教授 (50033832)
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| Project Period (FY) |
1994 – 1996
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| Keywords | B-meson / semileptonic decay / Higgs system / Kobayashi-Maskawa / HQET / CP-nonconservation / NMSSM / spontaneous symmetry breakdown |
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| Research Abstract |
This year is the last one of the three-years project titled as "The analysis of the rare decay processes of B-meson and the physics beyond the standard model". We have performed the research on (1) spontaneous CP-violation in the next-to minimal supersymmetric standard model and the related topics like electric dipole moment of neutron and electron and on (2) semileptonic decay processes of B-meson into higher resonances of D-meson by using the Bjorken sum rule and on (3) the Kobayashi-Maskawa matrices of quarks and leptons in the superstring inspired model with discrete symmetry.
First, on the subject (1), we have analyzed the possibility of spontaneous CP-violation in the minimal supersymmetric standard model (NMSSM) with extra neutral singlet chiral Higgs field (NMSSM). We obtained the rather higherneutral Higgs masses (aroun 40GeV) compared to the scenario of the MSSM with spontaneous CP-violation. However the sum of two lightes neutral Higgs masses is around 100GeV.The charged Higgs mass is around a several hundred GeV region. These result, especially on the neutral Higgs masses, will be checked at the LEP-II experiment in close future.
The second subject has cleared that the branching ratio into higher resonances of D-meson should be rather large (a few percent) on the contrast to the analysis by using heavy quark effective theory and quark model. This result has been obtained by using the Bjorken sum rule.
In the last subject we have obtained the good results on Kobayashi-Maskawa Matrices which are consistent with the present experimental results. The characteristic features are reduced to the different quark mass mixing pattern of up-quark sectors and down quark sectors. We use the gauge symmetry as SU (6) *SU (2) _R with an appropriate discrete symmetry which rigorously restricts the super potential.
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