| Project/Area Number |
17540279
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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 |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | High Energy Accelerator Research Organization (KEK) |
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Principal Investigator |
HAZUMI Masashi High Energy Accelerator Research Organization (KEK), IPNS, Professor (20263197)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,250,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥150,000)
Fiscal Year 2007: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2006: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2005: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | elementary particle / CP violation / B meson |
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| Research Abstract |
In this research program, I tried to bring new ideas in searching for CP violation that arises from physics beyond the standard model of particle physics in 3-body B-meson decays. My approach was to systematically expand the "resonant amplification method" that I proposed previously and check whether we have useful modes other than the B+→ΦΦK+ decays that were already published. In particular, we pursued a possibility to search for a new CP-violating phase with a very small hadronic uncertainty by combining BO→ΦΦKs and B+→ΦΦK+ and furthermore by using flavor symmetry such as flavor SU (2). In addition to hadronic decays mentioned above, I also studied radiative 3-body B decays that are governed by the b→s transition. I found with colleagues in US and England a novel method that uses B→PVg decays, where P and V are pseudo-scalar and vector mesons, respectively. We found that the new method has the smaller hadronic uncertainties than the other methods so far proposed for radiative decays. We submitted a preprint to describe our new method (hep-ph/0701021). I also studied these decays using data taken at the Belle experiment, which is a B factory at KEK. Furthermore, my colleagues and I performed a beamtest to evaluate prototype sensors. We confirmed that the pipeline readout scheme that used APV25 chips was suitable for experiments at high-luminosity electron-positron colliders. In particular, we confirmed that superb time resolution can be obtained by reading out three consecutive time slices to reconstruct wave forms.
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