摘要
高能重离子碰撞中K^+/π^+比例的显著升高被认为是夸克、胶子等离子体形成的一个可能信号。基于参加者核子模型和次级粒子形成时间的概念,本文对Si(14.5AGeV/c)与Au的中心碰撞进行了Monte Carlo模拟计算。在计算中考虑了如下次级碰撞过程:πN→K^+Y、ππ→KK以及πN的单电荷交换反应。本文的计算结果表明:由这些次级碰撞过程导致的末态的K^+/π^+比例的升高不足以解释BNL的E802组观测到的实验数据。
The enhancement of K^+/π^+ ratio in the high energy heavy--ion collision is believed to be a possible signature of the formation of the quark gluon plasma. Based on the Participant Nucleon Model and the concept of the formation time of secondary particles, the K^+/π^+ ratio in the central collision of Si(14. 5GeV/c) and Au are calculated by Monte Carlo simu- lation. The following secondary collisions areconsidered. πN→K^+ Y、ππ→KK and the single charge exchange reaction between pions and nucleons. The calculation results show that the increased K^+/π^+ ratio caused by these secondary collisions is not enough to explain the experi- rnental data observed by the E802 group at BNL.
出处
《高能物理与核物理》
CSCD
北大核心
1992年第1期44-50,共7页
High Energy Physics and Nuclear Physics
