RHIC能量多粒子产生的双源统计模型分析  

Analysis of Multi-Particle Production at RHIC by Two-Source Statistical Model

作　　者：陆中道[1] 萨本豪[1] Amand Faessler C.Fuchs E.E.Zabrodin 

机构地区：[1]中国原子能科学研究院 [2]InstituteforTheoreticalPhysics

出　　处：《高能物理与核物理》2002年第11期1166-1171,共6页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 (1 9975 0 75 )资助~~

摘　　要：用双源统计模型分析研究了SNN=1 3 0GeVAu +Au反应中的多粒子产生并与单源统计模型的结果进行了比较 .研究表明 ,该反应有一个高温且大体积的内源 .这个源的温度比SPS能量的内源至少高 1 5MeV ,体积至少大 2倍 。The data of multi particle production in S NN =130 GeV Au+Au collisions are analyzed by two source statistical model. It is found that in this reaction the two sources (inner source and outer source) are identical. They have the same temperature, volume, particle density and other thermodynamic quantities. Besides, the results of two source model are identical with that of single source model (the total volume of the two sources equals the volume of single source). The identities between two sources and between two models are due to the particles being measured in a limited central rapidity region. The S NN =130 GeV Au+Au collision has large rapidity region , while data are taken from a small pseudo rapidity region, η <0.5. In the region, the particles are uniformly distributed as a single source. Comparing to the inner source in 158 A GeV/c Pb+Pb collision, which has a small and hot inner source surrounded by a larger and cooler outer source, the temperature is at least 15MeV higher and the volume is at least two times larger. The RHIC can provide a hot and large inner source that may be formed in the early stage of hadronization from QGP and may have important physical content behind. We suggest to make synchronous measurement in the outer region, e.g. 3< y <4, so as to make comparison.

关 键 词：双源统计模型 RHIC能量 多粒子产生 相对论性重离子碰撞 

分 类 号：O572.2[理学—粒子物理与原子核物理]