介质对部分子劈裂几率的影响  

Medium-Induced Parton Splitting Probability

作　　者：向文昌[1] 丁亨通[1] 周代翠[1] 

机构地区：[1]华中师范大学粒子物理研究所,武汉430079

出　　处：《高能物理与核物理》2006年第9期863-867,共5页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(10575044);教育部重大科研项目([2006]55)资助~~

摘　　要：利用部分子在热密QCD介质中的辐射谱,研究部分子在热密介质中的演化规律．研究结果表明,在相同能量下介质诱导效应使得部分子在介质中的劈裂几率大于部分子在真空中的劈裂几率；高密度介质中的部分子劈裂几率大于低密度介质中的劈裂几率．本文研究结果与美国BNL/RHIC相对论重离子碰撞实验中观测到的高横动量强子产额压低现象一致,揭示了在RHIC能区已经生成高温高密物质．The parton shower evolution law in the hot and dense matter is studied by using the spectrum of parton radiative energy loss. At the same energy, the numerical results indicate that the splitting probability of parton, in the medium, is large than those in the vacuum. And when the density of medium is higher, the splitting probability of parton is larger. This result is in agreement with the suppression of leading particles production in BNL/RHIC,it indicates that the hot and dense matter has already been produced at RHIC energy.

关 键 词：高能重离子碰撞 部分子簇射演化规律 部分子辐射能量损失 

分 类 号：O571.4[理学—粒子物理与原子核物理]