相对论性核碰撞中Φ介子产生和弦碎裂函数

ΦMeson Production and String Fragmentation Function in Relativistic Nucleus-Nucleus Collisions

用强子和弦级联模型LUCIAE系统研究从AGS到SPS ,到RHIC ,再到LHC能量核 -核碰撞中介子产生 .采用与能量有关弦碎裂函数 ,并通过与荷电粒子多重数实验数据的比较确定其中的参数后 ,LUCIAE模型给出的介子产额与实验数据也都相近 ,得到的事件平均弦碎裂变量随能量之增趋饱和规律 ,可能是核穿透性能量行为的定性表示 .

Using a hadron and string cascade model,LUCIAE,the  meson production in relativistic nucleus-nucleus collisions was systematically investigated from AGS energy,to SPS,to RHIC,up to LHC energy. After considering the energy dependence of the model parameter in string fragmentation function and fitting it to the experimental data of charged multiplicity,the results of  meson yield were comparable with experimental data. The obtained string fragmentation variable showed a saturation in dependence with energy,that might be a qualitative representation of the energy dependence of nuclear transparency.