2006 Fiscal Year Final Research Report Summary
Perturbative and Non-Perturbative Analyses of Strong Coupling Field Theories
| Project/Area Number |
13135216
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| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Hiroshima University |
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Principal Investigator |
NAKAMURA Atsushi Hiroshima University, Information Media Center, Professor (30130876)
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| Co-Investigator(Kenkyū-buntansha) |
OKAWA Masanori Hiroshima University, Graduate School of Science, Professor (00168874)
KODAIRA Jiro High Energy Accelerator Research Organization, Institute for Particle and Nuclear Stuides, Professor (40127080)
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| Project Period (FY) |
2001 – 2006
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| Keywords | QCD / Hadron / non-perturbative / quarks / gluons |
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| Research Abstract |
Recently, there have been many new and/or precise experiments of hadrons, which consist of quarks and gluons and interact strongly. Based on QCD (Quantum Chromo-Dynamics), which is a strong coupling field theory, our group has pursued the perturbative and non-perturbative studies.
QCD is expected to have a rich phase structure by changing the temperature and/or density. Indeed high energy heavy ion collision experiments have been done to find such states, and a new state of matter was found at RHIC. Now it is possible to perform a lattice QCD numerical simulation including pair-creating and annihilation of light quarks in the vacuum, i. e. a calculation to simulate a realistic world, and we performed and studied such QCD simulations. Also many experiments including hadron spin measurements were done, and we can apply QCD at small x regions and diffractive scatterings.
In order to understand the mechanism of the confinement of quarks, we calculated the instantaneous part of quark potential, i. e., color Coulomb potential based on Gribov-Zwanziger scenario. The non-confinement system discovered at RHIC is not a free gas of quarks and gluons, but strongly interacting system; it is argued that it is a perfect fluid. To check this possibility based on QCD, we calculate the transport coefficients of gluonic matter. We apply also a new method which is valid in a wide range of Q_T to Drell-Yan reaction of polarized protons, and calculated the cross-sections systematically. We analyzed also quark propagators in the confinement and deconfinement phases, and studied its pole structure.
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