LHC能量下重離子碰撞的多πHBT關聯(lián)
發(fā)布時間：2024-04-10 23:56
在大型強子對撞機(LHC)能量(核子對質(zhì)心能量在TeV量級)下,重離子碰撞產(chǎn)生的π介子多重數(shù)可數(shù)以千計。在這種情況下,粒子發(fā)射源內(nèi)的全同π介子很可能發(fā)生玻色-愛因斯坦凝聚,從而對全同π介子的Hanbury Brown-Twiss(HBT)關聯(lián)造成抑制。最近,歐洲核研究機構(CERN)的ALICE合作組在對LHC上運行的(?)=2.76 TeV Pb-Pb碰撞的實驗數(shù)據(jù)分析中,發(fā)現(xiàn)實驗測量到的全同π介子的3 π和4 π關聯(lián)有嚴重的抑制。這表明π介子的發(fā)射很可能有較高程度的相干性。為了解釋這一實驗測量結果,本文基于考慮了全同π介子玻色-愛因斯坦凝聚的膨脹π介子氣體演化源模型和由相干發(fā)射顆粒構成的顆粒源模型,系統(tǒng)地研究了在上述實驗中全同π介子的3π和4π HBT關聯(lián),以及正規(guī)化的3π和4π關聯(lián)函數(shù)。本文分為以下幾個部分。第一章,簡要介紹了相對論重離子碰撞的研究背景、最新的多π HBT關聯(lián)實驗結果和本文的研究動機。第二章,介紹了與本文研究相關的基礎理論,包括2 πHBT關聯(lián)的量子統(tǒng)計理論,全同π介子氣體的玻色-愛因斯坦凝聚以及相對論重離子碰撞中π介子發(fā)射的顆粒源模型。第三章,研究了有玻色-愛因...
【文章頁數(shù)】：123 頁
【文章目錄】：
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
作者簡介
本文編號：3950555
【文章頁數(shù)】：123 頁
【文章目錄】：
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
作者簡介
本文編號：3950555
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