Hadronic dynamical processes at High temperature/density

高温/密度下的强子动力学过程

基本信息

批准号：
08640385
负责人：
YABU Hiroyuki
金额：
$ 1.34万
依托单位：
TOKYO METROPOLITAN UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08640385/
关键词：
Stochastic Process High-energy heavy ion collision Chiral symmetry Nonlinear model Vortex Spin polarization Quark model Nucleon collision 散逸効果ボーズ・アインシュタイン凝縮超流動スピン模型中間子凝縮

项目摘要

1. The stochastic field equation was derived from the chiral symmetric meson model by the Caldeira-Leggett method with the elimination of the on-mass shell fluctuation on the condensates. We studied that equation and got the results : 1) With evaluating the asymptotic behavior, we showed the stochastic properties of the solution and got the stochastic coefficient algebraically. 2) We applied that equation to the neutral DCC process and found the meta-stability of the neutral DCC.3) The charged DCC was studied with the same method. We pointed that the charged DCC was a steady state. Its life-time was estimated . We also estimated the decay life-time with photon radiation and found the smallness of it. 4) As an application to other physical system, we made the derivation of stochastic/non-stochastic forces for the superfluid/spin vortices and their topological interpretations.2. To understand the spin polarization of hadrons generated in high-energy nucleon collisions, we formulated the unified theory on the basis of the quark recombinations and studied it numerically : 1) We found that the theory works well for the case of valence quark process. 2) We proposed the new reaction process with quark production in the early stage for no valence quark case. 3) The possibility of quark-parton spin polarization was pointed for the analyzing power for the Lambda hyperon produced in the polarized nucleon collision.3. The model studies were done to understand the energy stochastic mechanism with the energy flow from the collective degrees to the background degrees of freedom.4. We had a mini-workshop "Dynamical stochastic process in quantum many body system" at Tokyo Metropolitan University on Feb.2, 1999.

1。随机场方程是通过Caldeira-Leggett方法从手性对称介子模型得出的，并消除了冷凝水上的质量壳波动。我们研究了该方程并得到结果：1）通过评估渐近行为，我们显示了溶液的随机特性，并通过代数获得随机系数。 2）我们将该方程式应用于中性DCC过程，并发现中性DCC的元稳定性。3）用相同的方法研究了带电的DCC。我们指出，充电的DCC是稳定状态。它的终生是估计的。我们还估计了光子辐射的衰减寿命，并发现了它的较小性。 4）作为对其他物理系统的应用，我们为超流体/自旋涡流及其拓扑解释衍生了随机/非探索力2。为了了解高能核子碰撞中产生的黑龙的自旋极化，我们根据夸克的重组制定了统一理论，并以数值为单位进行了研究：1）我们发现该理论在价夸克过程的情况下很好地工作。 2）我们提出了新的反应过程，并在早期阶段就生产夸克，没有价夸克情况。 3）指出了夸克 - 帕顿自旋极化的可能性，以分析在偏振核子碰撞中产生的lambda超子的分析能力3。进行模型研究是为了了解从集体程度到自由度的能量流动的能量随机机制。4。 1999年2月2日，在东京大都会大学，我们在东京大都会大学有一个迷你工作工厂的“量子系统动态随机过程”。