核碰撞末态带电粒子的赝快度分布
VIP免费
I
摘 要
高能核-核碰撞末态带电粒子的赝快度分布的研究是高能实验与理论物理研究
的重要课题之一, 人们通过高能实验收集的大量数据,为研究末态粒子的赝快度
分布以及分析末态产物—夸克-胶子等离子体(QGP)提供了依据.
本文给出了核子-核子碰撞末态带电粒子的赝快度分布函数,采用核-核碰撞的
Glauber 模型,得出高能核-核碰撞中的平均参与者数、平均二元核子-核子碰撞数、
带头粒子数和旁观者数,在考虑能量损失、旁观者效应和带头粒子效应后,获得核-
核碰撞的末态带电粒子的赝快度分布方程, 与 PHOBOS 合作组
NN
s
=200、130、
62.4 和19.6GeV 的Au+Au 碰撞和
NN
s
=200、
62.4 和22.4GeV 的Cu+Cu 碰撞末态
带电粒子的赝快度分布的实验结果符合得很好.最后根据 Bjoken 提出的粒子的空
间位置和快度变量的关系,利用夸克-胶子等离子体(QGP)的流体动力学演化,我
们分析了高能核-核碰撞中产生粒子的初始能量密度与固有时的关系.本文主要有
六部分组成.
第一部分简单介绍研究高能核-核碰撞的末态带电粒子赝快度分布的意义和目
前几种理论研究模型,以及本文研究的内容.
第二部分根据核子-核子碰撞的实验图,考虑带头粒子效应,得到核子-核子碰
撞末态带电粒子的赝快度分布.
第三部分利用 Glauber 模型计算出核-核碰撞过程中的平均参与者数、平均二
元核子-核子碰撞数、带头粒子数和旁观者数.
第四部分在前面部分的基础上,考虑能量损失、旁观者效应和带头粒子效应,
给 出 核 - 核 碰 撞 的 末 态 带 电 粒 子 的 赝 快 度 分 布 方 程 , 与 PHOBOS 合 作 组
NN
s
=200、130、62.4 和19.6GeV 的Au+Au 碰撞和
NN
s
=200、62.4 和22.4GeV
的Cu+Cu 碰撞中末态带电粒子的赝快度分布的实验结果符合得很好.
第五部分估算高能核-核碰撞中产生粒子的初始能量密度,并对
NN
s
=200GeV
的Au+Au 碰撞和 Cu+Cu 碰撞中产生粒子的初始能量密度值在固有时为
fm/c2.14.0
时进行估算.
第六部分是整篇文章的总结和展望.
关键词:核子-核子碰撞 Glauber 模型 参与者数 带头粒子 旁观者数
核-核碰撞 赝快度分布 初始能量密度
II
ABSTRACT
The research of the pseudorapidity distributions of charged particles in high energy
nucleus-nucleus collisions is one of the important subjects in the high energy
experiments and theoretical physics research. The data collected by people from
experiments provides the basis for researching the pseudorapidity distributions of
charged particles and analyzing the matters in the final state - Quark Gluon Plasma.
In this paper, the pseudorapidity distributions of charged particles in nucleon-nucleon
collisions are presented at the first, then, by using the Glauber model of nucleus-nucleus
collisions, we calculate the mean numbers of participants 、leading particles 、binary
nucleon-nucleon collisions and spectators. Considering the effects of energy loss 、
leading particles and spectators, we get the pseudorapidity distributions of charged
particles in nucleus-nucleus collisions, which are consistent with the experimental
observations of the pseudorapidity distributions of charged particles in Au+Au
collisions at
NN
s
=200 、130 、62.4 and 19.6GeV,and in Cu+Cu collisions at
NN
s
=200、62.4 and 22.4GeV made by the PHOBOS collaboration. Finally, based on
the relationship of space-time coordinate to rapidity distribution presented by Bjoken,
by using the hydrodynamics evolvement of quark-gluon plasma, we analyze the
relationship of the initial energy density and the initial production time. This paper is
formed by six parts.
First part, we briefly introduce the important meaning of studying the
pseudorapidity distributions of charged particles in high energy heavy-ion collisions and
several theoretical models at present. The content of research will be discussed in the
paper.
Second part, based on the experimental diagrams of nucleon-nucleon collisions, we
get the pseudorapidity distribution of charged particles in nucleon-nucleon collisions.
Third part, by using Glauber model, we calculate the mean numbers of
participants、binary nucleon-nucleon collisions 、leading particles and spectators.
Fourth part, based on the contents of frontal parts, Considering the effects of
energy loss、leading particles and spectators, we get the pseudorapidity distributions of
charged particles in nucleus-nucleus collisions, which are consistent with the
experimental observations of the pseudorapidity distributions of charged particles in
III
Au+Au collisions at
NN
s
=200、130、62.4 and 19.6GeV,and in Cu+Cu collisions at
NN
s
=200、62.4 and 22.4GeV made by the PHOBOS collaboration.
Fifth part, we estimate the initial energy density of produced particles in high
energy nucleus-nucleus collisions, and discuss the initial energy density of produced
particles in Au+Au collisions and Cu+Cu collisions at
NN
s
=200GeV in the initial
production time region of
fm/c2.14.0
.
In the finaly part, we give the summary and the expectation of this paper.
Key Word: nucleon-nucleon collisions, Glauber model, participants,
leading-particle, spectators, the number of nucleon-nucleon
collisions, nucleus- nucleus , pseudorapidity distributions,
initial energy density
IV
目录
中文摘要
ABSTRACT
第一章 绪 论................................................................................................................1
§1.1 高能重离子碰撞物理和重离子对撞机.....................................................1
§1.2 赝快度分布的研究意义.............................................................................1
§1.3 唯象理论模型.............................................................................................2
§1.3.1 袋模型(MIT 模型) .......................................................................... 2
§1.3.2 QM 势模型......................................................................................... 3
§1.3.3 弦模型.................................................................................................3
§1.3.4 部分子模型.........................................................................................3
§1.3.5“泡”或“壳”模型(SLAC 模型).....................................................4
§1.3.6 多链模型.............................................................................................4
§1.3.7 单源(火球)模型.................................................................................5
§1.3.8 双源(火球)模型.................................................................................5
§1.3.9 三源(火球)模型.................................................................................6
§1.3.10 多源模型...........................................................................................6
§1.3.11 热化柱模型和火条模型...................................................................7
§1.4 本文工作.....................................................................................................7
第二章 核子-核子碰撞末态带电粒子的赝快度分布................................................8
§2.1 概述.............................................................................................................8
§2.2 核子-核子碰撞末态粒子的赝快度分布...................................................8
§2.3 结论...........................................................................................................10
第三章 高能核-核碰撞中的参与者数、带头粒子数、旁观者数和
平均二元核子-核子碰撞数..........................................................................11
§3.1 概述...........................................................................................................11
§3.2 高能核-核碰撞中的参与者数、带头粒子数和旁观者数.....................11
§3.3 高能核-核碰撞中的二元核子-核子碰撞数...........................................14
§3.4 结论...........................................................................................................16
第四章 高能核-核碰撞末态带电粒子的赝快度分布..............................................17
V
§4.1 概述...........................................................................................................17
§4.2 核-核碰撞末态带电粒子的赝快度分布.................................................17
§4.2.1 二元核子-核子碰撞末态带电粒子的快度分布.............................18
§4.2.2 旁观者和带头粒子的快度分布.......................................................19
§4.2.3 核-核碰撞末态带电粒子的赝快度分布.........................................20
§4.3 结论...........................................................................................................25
第五章 高能核-核碰撞与 QGP 的产生......................................................................26
§5.1 概述...........................................................................................................26
§5.2 核-核碰撞末态产生粒子的初始能量密度.............................................27
§5.3 结论...........................................................................................................31
第六章 总结和展望....................................................................................................33
§6.1 总结...........................................................................................................33
§6.2 展望 ........................................................................................................33
参考文献......................................................................................................................35
在读期间公开发表的论文..........................................................................................39
致谢..............................................................................................................................40
摘要：
展开>>
收起<<
I摘要高能核-核碰撞末态带电粒子的赝快度分布的研究是高能实验与理论物理研究的重要课题之一,人们通过高能实验收集的大量数据,为研究末态粒子的赝快度分布以及分析末态产物—夸克-胶子等离子体(QGP)提供了依据.本文给出了核子-核子碰撞末态带电粒子的赝快度分布函数,采用核-核碰撞的Glauber模型,得出高能核-核碰撞中的平均参与者数、平均二元核子-核子碰撞数、带头粒子数和旁观者数,在考虑能量损失、旁观者效应和带头粒子效应后,获得核-核碰撞的末态带电粒子的赝快度分布方程,与PHOBOS合作组NNs=200、130、62.4和19.6GeV的Au+Au碰撞和NNs=200、62.4和22.4GeV的C...
相关推荐
-
跨境电商商业计划书模版VIP免费
2025-01-09 6 -
跨境电商方案范文VIP免费
2025-01-09 6 -
创业计划书VIP免费
2025-01-09 6 -
xx生鲜APP计划书VIP免费
2025-01-09 6 -
跨境电商创业园商业计划书(盈利模式)VIP免费
2025-01-09 6 -
跨境电商计划书VIP免费
2025-01-09 7 -
绿色食品电商平台项目计划书VIP免费
2025-01-09 6 -
农产品电子商务商业计划书VIP免费
2025-01-09 6 -
农村电商平台商业计划书VIP免费
2025-01-09 7 -
生鲜商城平台商业计划书VIP免费
2025-01-09 6
作者：牛悦
分类：高等教育资料
价格：15积分
属性：44 页
大小：787.75KB
格式：PDF
时间：2024-11-19
