低动量末态粒子的模拟和探测对Ξ重子谱研究的影响

Effects of Simulation and Detection of Low-Momentum Final State Particles on the Research of Baryon Spectroscopy

北京正负电子对撞机上的BES实验为系统地进行重子谱研究提供了一个很好的舞台 .由于很多待研究的衰变道末态为多个小动量的粒子 ,给探测和分析带来困难 .本工作以通过衰变道J ψ→ Ξ+ ΛK-研究Ξ 激发态为例 ,比较了不同模型的蒙特卡罗模拟 ,并结合实验数据 ,分析了该类型重子谱研究的探测限及产生子和探测器模拟对结果的影响 .

The BES experiment at Beijing electron-position collider provides an excellent laboratory for the research of Baryon spectroscopy. Some difficulties arise due to the oftenappeared low-momentum of final state particles in such research. Using Ξ * spectrum study from the decay J/ψ→ +ΛK - as an example, we analyzed and compared the effects on the results with different versions of MC simulation, as well as the experimental data of low momentum particles, and derived the detection limit for this channel.