Explore QCD phase transition with thermal photons  

作　　者：LIU Fuming 

机构地区：[1]Institute of Particle Physics and Key Laboratory of Quark & Lepton Physics(MOE),College of Physical Science & Technology,Central China Normal University

出　　处：《Nuclear Science and Techniques》2013年第5期127-131,共5页核技术（英文）

基　　金：Supported by National Natural Science Foundation of China(NSFC) projects (No.11275081);Program for New Century Excellent Talents in University(NCET)

摘　　要：This pilot study was to assess the high temperature and zero baryon density region of quantum chromodynamics(QCD) phase diagram with thermal photon emission,where the nature of QCD phase transition is ambiguous.Based on a(3+1)-D ideal hydrodynamical model to describe macroscopically the collision system,thermal photons emitted from Pb+Pb collisions at 2.76 TeV are investigated.The result reveals that photons from heavy ion collisions at high energy and centrality are possible to distinguish the structure of the hot dense matter,in QGP phase or hadronic phase,thus may provide an approach to explore the nature of this finite-temperature QCD transition(that is,first-order,second-order or analytic crossover).This pilot study was to assess the high temperature and zero baryon density region of quantum chromodynamics （QCD） phase diagram with thermal photon emission, where the nature of QCD phase transition is ambiguous. Based on a （3＋1）-D ideal hydrodynamical model to describe macroscopically the collision system, thermal photons emitted from Pb＋Pb collisions at 2.76 TeV are investigated. The result reveals that photons from heavy ion collisions at high energy and centrality are possible to distinguish the structure of the hot dense matter, in QGP phase or hadronic phase, thus may provide an approach to explore the nature of this finite-temperataare QCD transition （that is, first-order, second-order or analytic crossover）.

关 键 词：量子色动力学 动力学相变 热光子 QCD相变 流体动力学模型 光子发射 碰撞系统 重离子碰撞 

分 类 号：O572.243[理学—粒子物理与原子核物理] O414.2[理学—物理]