1992 Fiscal Year Final Research Report Summary
Exploration of the origin of CP violation
| Project/Area Number |
02640230
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
核・宇宙線・素粒子
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| Research Institution | Osaka University |
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Principal Investigator |
TAKASUGI Eiichi Osaka University, College of General education, Professor, 教養部, 教授 (00135633)
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| Co-Investigator(Kenkyū-buntansha) |
KURIMOTO Takeshi Osaka University, College of General education, Research Associate, 教養部, 助手 (10195563)
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| Project Period (FY) |
1990 – 1992
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| Keywords | Spontaneous CP violation / Right-handed interaction / Effective theory of hadron / Charge non-conservation / Charged neutrinos and neutron / Seasonal oscillation of solar neutrino / Twisted toroidal magnetic fields / Upper bound on Higgs masses |
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| Research Abstract |
In this research project, we made the work to clarify the origin of symmetries and their breaking mechanisms.
(1) The spontaneous breaking of CP symmetry: By extending the standard model, we made models of spontaneous breaking of CP symmetry in the model with the right-handed interaction. We explored the possibility of light right-handed gauge boson W_R. We found new features; CP violation arises mainly from the right-handed interaction and large CP violation is expected in B_S decays. Various phenomenological aspects are discussed.
(2) The effective theory of hadron interaction: To convert the interaction among quarks into hadrons is an difficult and important problem. By using chiral dynamics and the effective heavy quark theory, we examined various decays, especially those related to CP violation.
(3) The charge non-conservation: In the extension of the standard model with two Higgs doublets and one singlet, it is shown that the charge symmetry can be violated. As a result, neutrinos, neutron and atoms can have mini-charges which may be observed.
(4) Solar neutrino: We showed that if neutrinos have large magnetic moments, the observation of the solar neutrino will provide a tool to explore the solar activities especially the dynamics of magnetic fields. we showed that the twisted magnetic fields causes the seasonal variation of the solar neutrino flux which reproduces the Cl data well and is consistent with the Kamiokande II data.
(5) Mass spectrum of Higgs bosons: The upper bound of the lightest Higgs boson mass among four physical ones in two doublet model is shown to be 1/ROO<3> of the standard model case, that is, 580GeV.
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