相对论Pb+Au碰撞产生的低不变质量双轻子

Low invariant mass dilepton production from relativistic Pb+Au collisions

利用强子相互作用和流体动力学模型,给出了相对论Pb+Au碰撞中低不变质量双轻子产生的唯象公式,还考虑了有限温度QCD求和规则对ρ介子手征对称性部分恢复导致的质量移动,数值计算结果能够较好地解释SPS能区的Pb+Au 158 AGeV碰撞实验结果.

Based on the hadron interaction and the relativistic hydrodynamics models, the low invariant mass dilepton production from the relativistic Pb＋Au collisions is calculated. The chiral mass dropping effect is also considered by using the QCD sum rule. The numerical results agree well with the experimental data from the SPS Pb＋Au 158 A GeV collisions.