【摘要】 用建立在ＬＵＮＤ弦模型特别是ＰＹＴＨＩＡ事件产生器基础上的描写极端相对论性核一核碰撞的强子和弦级联模型——ＪＰＣＩＡＥ研究了入射能量为２００Ａ ＧｅＶ的 Ｓ＋ Ａｕ中心碰撞中光子产生．模型同时考虑了部分子 ＱＣＤ散射过程、强子末态相互作用以及强子衰变等光子产生反应道并作了协调处理．ＪＰＣＩＡＥ模型计算结果很好再现了ＷＡ９３实验数据所呈现的低横动量增强效应．更多还原

【Abstract】 A hadron and string cascade model, JPCIAE, which is based on LUND string model, PYTHIA event generator especially, is used to study the photon production of 200 A GeV S + An central collisions. The model takes into account photon produced from the partonic QCD scattering processe, the final-state hadronic interaction, and hadronic decay and deals with them consistently. The results of JPCIAE model reproduce successfully the WA93 data of low P_T enhancement. We have compared the contributions from different decay channels and discussed the role played by rescattering.更多还原