Study of high energy nuclear reactions based on quantum chromodynamics

高能核反应有两个方面，一个是通过大动量转移的基元过程与微扰QCD有关，另一个是通过参与反应的强子的内部结构及其初、终态相互作用与非微扰QCD有关。在本研究计划中，Nambu乔纳- Lasino模型作为核子内部结构的相对论模型进行了研究。在NJL模型的研究中，我们计算了夸克的标量密度，并计算了核物质中的H-重子，以及核物质中的H-重子，作为观察高能反应内部结构的手段。轴向矢量耦合常数和核子磁矩，以考察相对论Faddeev方程解的性质方程，并证实，所观察到的性质的核子是全球再现。我们也对这三者进行了比较 ...更多信息 基于Faddeev方法的夸克图像和基于平均场方法的孤子图像。结果表明，在平均场方法中引入两体关联可以解决长期存在的解的稳定性问题，而夸克间的π介子交换对Faddeev方法有重要贡献。已经发现相对论效应抑制了被大动量转移压缩的质子的膨胀速率，并且在颜色透明度。用相对论谐振子夸克模型研究了上述抑制。在此基础上，利用Brueckner理论研究了核物质中的H-重子，并计算了有效质量和阱深。还研究了H-LAMBDALAMBDA偶联的影响。少

High energy nuclear reaction has two aspects, one related to perturbative QCD through elementary processes at large momentum transfers and the other related to non- perturbative QCD through the internal structure of participating hadrons and their initial and final state interactions. In this research project, the Nambu Jona- Lasino model has been studied as a relativistic model of the nucleon internal structure. The nuclear transparency which is a measure of initial and final state interactions and the H-dibaryon in nuclear matter have been also studied as means of observing the internal structure in high energy reactions.In the study of the NJL model, we have calculated the quark scalar density, the axial vector coupling constant and the magnetic moment of the nucleon in order to examine the properties of the solution for th relativistic Faddeev equation and confirmed that the observed properties of the nucleon are globally reproduced. We have also made a comparison between the three … More -quark picture based on the Faddeev approach and the soliton picture based on the mean field approach. It has been found that the inclusion of the two-body correlation in the mean field approach may solve the long-standing problem about the stability of the solution and the pion exchange between the quarks gives an important contribution in the Faddeev approach.As for the nuclear transparency, the relativistic effect has been found to suppress the expansion rate of the proton squeezed by the large momentum transfer and play an essential role in the color transparency. A relativistic harmonic oscillator quark model has been used to study the above suppression. The extension of the study to the cases of hadronic quasi-elastic processes such as (p, 2p) and (pi, pi'p) are under way.H-dibaryon in nuclear matter has been studied by the Brueckner theory based on the H-nucleon interaction we obtained previously and the effective mass and the well depth have been calculated. The effects of H-LAMBDALAMBDA coupling have been also examined. Less