2006 Fiscal Year Final Research Report Summary
Research on the chiral phase transition and hadron properties in QCD at finite temperature and density
| Project/Area Number |
16540241
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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 | Nagoya University |
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Principal Investigator |
HARADA MASAYASU Nagoya University, Graduate School of Science, Profesor, 大学院理学研究科, 教授 (40311716)
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| Project Period (FY) |
2004 – 2006
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| Keywords | Quantum Chromo-Dynamics (QCD) / Chiral symmetry / low-energy effective theory / vector meson dominance / radiative decay / Schwinger-Dyson equation / Bethe-Salpeter equation |
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| Research Abstract |
1. Analysis based on the vector manifestation (VM)
I proposed the VM, in which the π and p meson becomes the chiral partner near the chiral phase transition point in hot and/or dense QCD. I performed the following analyses to test the VM experimentally.
(1) I showed that the model based on the VM reproduces the mass of newly found D meson.
(2) Based on the VM, I studied the dilepton spectrum including the effect of violation of vector dominance. I showed that the predicted spectrum is smaller than the one by the model with the vector dominance.
2. Construction of new effective field theory (EFT) including π, p and a_1 mesons
I constructed a new EFT which includes the a_1 meson in addition to π and p mesons. I showed that both masses of p and a_1become light near the chiral phase transition point.
3. Proposal of a way for including systematic corrections in an AdS/QCD model
I proposed a way for including systematic corrections in a AdS/QCD mode. I showed that the prediction well reproduces the experiment.
4. Analysis on the radiative decays of φ meson
It is needed to clarify properties of scalar mesons in true-life QCD to construct a new effective model with scalar mesons near the chiral phase transition point. I made an analysis on the φ radiative decays, and showed that the prediction of our model is better than other models.
5. Analysis on the chiral phase transition in large flavor QCD
I performed an analysis of the large flavor QCD using the Schwinger-Dyson equation and the Bethe-Salpeter equation. I first showed that the mass difference between π^+ and π^0 in real-life QCD. Then, I showed that the mass difference is increased near the chiral phase transition point of large flavor QCD.
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Research Products
(18 results)
