LHC能量下重离子碰撞的多πHBT关联
发布时间：2024-04-10 23:56
在大型强子对撞机(LHC)能量(核子对质心能量在TeV量级)下,重离子碰撞产生的π介子多重数可数以千计。在这种情况下,粒子发射源内的全同π介子很可能发生玻色-爱因斯坦凝聚,从而对全同π介子的Hanbury Brown-Twiss(HBT)关联造成抑制。最近,欧洲核研究机构(CERN)的ALICE合作组在对LHC上运行的(?)=2.76 TeV Pb-Pb碰撞的实验数据分析中,发现实验测量到的全同π介子的3 π和4 π关联有严重的抑制。这表明π介子的发射很可能有较高程度的相干性。为了解释这一实验测量结果,本文基于考虑了全同π介子玻色-爱因斯坦凝聚的膨胀π介子气体演化源模型和由相干发射颗粒构成的颗粒源模型,系统地研究了在上述实验中全同π介子的3π和4π HBT关联,以及正规化的3π和4π关联函数。本文分为以下几个部分。第一章,简要介绍了相对论重离子碰撞的研究背景、最新的多π HBT关联实验结果和本文的研究动机。第二章,介绍了与本文研究相关的基础理论,包括2 πHBT关联的量子统计理论,全同π介子气体的玻色-爱因斯坦凝聚以及相对论重离子碰撞中π介子发射的颗粒源模型。第三章,研究了有玻色-爱因...
【文章页数】：123 页
【文章目录】：
摘要
Abstract
1 Introduction
1.1 QCD phase diagram and QGP
1.2 Recent experimental results of multi-pion HBT correlations
1.3 Thesis motivations and main works
2 Fundamental theories and models involved
2.1 Quantum statistics theory of two-pion HBT correlation
2.2 Bose-Einstein condensation of identical pion gas
2.3 Granular source model of pion emission in relativistic heavy-ion colli-sions
3 Multi-pion HBT correlations in the EPG model with B-E condensation
3.1 Overview and introduction
3.2 Model and multi-pion correlation formulas
3.2.1 EPG model
3.2.2 Calculations of multi-pion correlation functions in EPG model
3.3 Analyses of multi-pion correlations in EPG model
3.3.1 Three-pion correlations in EPG model
3.3.2 Four-pion correlations in EPG model
3.4 Comparison with experimental data
3.4.1 Three-pion correlation function
3.4.2 Four-pion correlation function
3.4.3 Source condensation fraction
3.5 Discussions and conclusion
4 Influence of B-E condensation on normalized multi-pion correlation func-tions
4.1 Overview and introduction
4.2 Intercepts of normalized MPC functions
4.3 Results of normalized MPC functions in EPG model
4.3.1 r3(Q3) results
4.3.2 r4(Q4) results
4.4 Phase-space density for EPG sources
4.5 Discussions and conclusion
5 Analyses of multi-pion HBT correlations for the granular sources with co-herent pion-emission droplets
5.1 Overview and introduction
5.2 Multi-pion BEGs of static granular sources
5.3 Multi-pion HBT correlations in evolving granular source model
5.3.1 EGS model with coherent pion-emission droplets
5.3.2 Multi-pion correlation functions
5.3.3 Normalized multi-pion HBT correlation functions
5.4 Discussions and conclusion
6 Conclusions and outlook
6.1 Conclusions
6.2 Innovation points
6.3 Outlook
References
Publications
Acknowledgement
作者简介
本文编号：3950555
【文章页数】：123 页
【文章目录】：
摘要
Abstract
1 Introduction
1.1 QCD phase diagram and QGP
1.2 Recent experimental results of multi-pion HBT correlations
1.3 Thesis motivations and main works
2 Fundamental theories and models involved
2.1 Quantum statistics theory of two-pion HBT correlation
2.2 Bose-Einstein condensation of identical pion gas
2.3 Granular source model of pion emission in relativistic heavy-ion colli-sions
3 Multi-pion HBT correlations in the EPG model with B-E condensation
3.1 Overview and introduction
3.2 Model and multi-pion correlation formulas
3.2.1 EPG model
3.2.2 Calculations of multi-pion correlation functions in EPG model
3.3 Analyses of multi-pion correlations in EPG model
3.3.1 Three-pion correlations in EPG model
3.3.2 Four-pion correlations in EPG model
3.4 Comparison with experimental data
3.4.1 Three-pion correlation function
3.4.2 Four-pion correlation function
3.4.3 Source condensation fraction
3.5 Discussions and conclusion
4 Influence of B-E condensation on normalized multi-pion correlation func-tions
4.1 Overview and introduction
4.2 Intercepts of normalized MPC functions
4.3 Results of normalized MPC functions in EPG model
4.3.1 r3(Q3) results
4.3.2 r4(Q4) results
4.4 Phase-space density for EPG sources
4.5 Discussions and conclusion
5 Analyses of multi-pion HBT correlations for the granular sources with co-herent pion-emission droplets
5.1 Overview and introduction
5.2 Multi-pion BEGs of static granular sources
5.3 Multi-pion HBT correlations in evolving granular source model
5.3.1 EGS model with coherent pion-emission droplets
5.3.2 Multi-pion correlation functions
5.3.3 Normalized multi-pion HBT correlation functions
5.4 Discussions and conclusion
6 Conclusions and outlook
6.1 Conclusions
6.2 Innovation points
6.3 Outlook
References
Publications
Acknowledgement
作者简介
本文编号：3950555
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