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High Energy Nuclear Reactions and Creation of Quark-Gluon Plasma

高能核反应和夸克-胶子等离子体的产生

基本信息

批准号：
59540162
负责人：
KINOSHITA Kisei
金额：
$ 1.28万
依托单位：
Kagoshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1984
资助国家：
日本
起止时间：
1984 至 1986
项目状态：
已结题

项目摘要

The purpose of this research was to investigate the mechanism of multi-particle production of hadrons in high-energy collisions involving nuclei, and the dynamics of quark-gluon plasma.For this purpose, we adopted two approaches. The first is to investigate dynamical aspects of quark-gluon plasma on the basis of hydrodynamical equation. The second is to develop event generation program for multi-chain model as a standard model of nucleus collisions, so as to confront the forthcoming data of high energy nucleus-nucleus collision.In the first approach, assuming the emergence of the quark-gluon plasma, we have analyzed its time-development on the basis of three-dimensional relativistic hydrodynamical equation of motion. As a result of numerical calculation, we found that transverse motion of the fluid have strong influence on the transverse momentum of produced hadrons and that its distribution gives an information of the initial state of the quark-gluon plasma.In the second approach, we have studied jets in electronpositron pair annihilation using quark cascade model and analyzed heavy quark fragmentation in detail. Moreover, we constructed hadronic chain model for the analysis of high-energy collision of hadrons and/or nuclei and developed an event generation program using Monte-Carlo method. This is necessary to distinguish new phenomena such as production of quark-gluon plasma from the backgrounds. We found that this model describes dominant features in hadron-hadron collision and is also useful for the high-energy collisions involving nuclei.

本研究的目的是研究涉及原子核的高能碰撞中强子多粒子产生的机制，以及夸克-胶子等离子体的动力学。为此，我们采用了两种方法。第一个是在流体动力学方程的基础上研究夸克-胶子等离子体的动力学方面。二是开发多链模型的事件生成程序，作为核碰撞的标准模型，以应对即将到来的高能核-核碰撞数据。在第一种方法中，假设夸克-胶子等离子体的出现，我们基于三维相对论流体动力学运动方程分析了它的时间发展。通过数值计算，我们发现流体的横向运动对产生的强子的横向动量有很大的影响，其分布给出了夸克-胶子等离子体的初始状态的信息。在第二种方法中，我们利用夸克级联模型研究了正负电子对湮灭中的喷流，并对重夸克碎裂进行了详细分析。此外，我们构建了强子链模型来分析强子和/或原子核的高能碰撞，并使用蒙特卡罗方法开发了事件生成程序。这对于区分新现象（例如夸克-胶子等离子体的产生）与背景是必要的。我们发现该模型描述了强子碰撞中的主要特征，并且对于涉及原子核的高能碰撞也很有用。