高能强子-强子碰撞中喷注的产生与演化过程的动力学起伏  

On the Dynamical Fluctuations in the Production and Evolusion of Jets in High Energy Hadron-Hadron Collisions

作　　者：尹建武[1] 刘峰[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》2002年第5期477-483,共7页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 ( 1 9975 0 2 1 );湖北省教育厅科学研究重点项目 ( 2 0 0 1A4 30 0 8)~~

摘　　要：用蒙特卡洛方法对 63 0GeV c质子 -反质子碰撞中的无偏样本、喷注事件样本和喷注内样本中的动力学起伏进行了研究 .结果表明 ,喷注事件样本和电子 -正电子对撞的全事件样本相似 ,近似地有各向同性的动力学起伏 ,而喷注内样本则和电子 -正电子对撞的喷注一样 ,有类似于强子 -强子碰撞软过程的各向异性动力学起伏 .这表明 ,强子 -强子碰撞中喷注的产生和演化分别和电子 -正电子碰撞中喷注的产生和演化有类似的动力学性质 .The dynamical fluctuations in 3 different samples of 630 GeV/ c proton antiproton collisions are studied using Monte Carlo method. These are the mini bias event sample, the jetty event sample and the sample consisting of the hadrons inside jets. The jets are identified using cone algorithm. The results show that the jetty event sample mimic the whole event sample in high energy e +e - collisions has isotropic dynamical fluctuations, while the dynamical fluctuations inside jets are similar to those of the soft hadronic collisions, being isotropic in the transverse plane but anisotropic in the longitudinal transverse planes. This shows that the production and evolusion of jets (minijets) have similar dynamical fluctuation property as the production and evolusion of jets in e +e - collisions, respectively.\;The mini bias event sample is a mixture of the jet production processes of hard (semi hard) parton collisions and the soft hadron hadron collision processes. Therfore, it does not have simple dynamical fluctuation property.

关 键 词：高能强子-强子碰撞 蒙特卡洛方法 动力学起伏 自仿射分形 量子色动力学 喷注 

分 类 号：O572.21[理学—粒子物理与原子核物理]