2001 Fiscal Year Final Research Report Summary
| Project/Area Number |
09246105
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| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas (A)
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| Allocation Type | Single-year Grants |
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| Research Institution | Nagoya University |
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Principal Investigator |
SANDA Ichiro Nagoya University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (60242806)
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| Co-Investigator(Kenkyū-buntansha) |
SAKAI Norisuke Tokyo Institute of Technology, Department of science, Professor, 大学院・理工学研究科, 教授 (80108448)
KURIMOTO Takeshi Toyama University, Department of science, Assistant Professor, 理学部, 助教授 (10195563)
OKADA Yasuhiro High Energy Accelerator Reserch Organization, Professor, 素粒子原子核研究所, 教授 (20212334)
YANAGIDA Tsutomu Tokyo University, Department of science, Professor, 大学院・理学系研究科, 教授 (10125677)
HAGIWARA Kaoru High Energy Accelerator Reserch Organization, Assistant Professor, 素粒子原子核研究所, 助教授 (50189461)
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| Project Period (FY) |
1997 – 2000
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| Keywords | symmetry / CP symmetry / B factory / CP violation / B meson / elementary Particles |
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| Research Abstract |
B decay amplitudes involve non-perturbative dynamics. Thus a method to deal with non-perturbative dynamics is necessary. We have discovered that Perturbative QCD methods can be applied to two body B decays. This is a very important result. It allows us to extract physics out of two body B decays. The goal of this reserch is to compute all two body decay amplitudes. We have obtained the following results:
・ The size of penguin amplitudes. Recent experimental results show that penguin amplitudes are unexpectedly large. For PQCD to be useful, this enhancement of penguin amplitudes must be explained by PQCD. We have discovered that PQCD naturally predicts large penguin amplitudes. This comes from the fact that the integration range of PQCD covers the region aroulnd 1GeV which is much less than M_B and the Wilson coefficient C_6 increases quite rapidly below 2GeV.
・ Through our computation using PQCD, we have found that the annihilation diagrams involving penguin operators are large. This was contrary to the assumption made by many resercher in this field.
・ We have found that PQCD allows us to compute final state interaction phased.
We have computed B → ππ, Kπ, ρπ, ωπ and φK amplitudes. From these amplitudes, we have predicted Cp asymmetries and their theoretical errors.
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