北京谱仪顶点探测器触发效率的研究

Study of VC Trigger Efficiency on BESⅡ

模拟了北京谱仪 (BESⅡ )顶点探测器的触发判选系统 ,发现对于某些带次级顶点的衰变道 ,其顶点探测器触发效率较低 .并由此对BESⅡ中与效率相关的物理过程作了讨论 ,给相应的触发设计者提供参考 .

We simulated the VC trigger system of BESⅡ in the frame of SIMBES-the Geant-3 based detector simulation package,calculated the VC trigger efficiencies for certain decay channels and found that the VC trigger efficiencies from those events with the second vertexes and long decay length are low.From this point of view,considering the physics interests of BESⅢ,we discussed some typical decay channels related with trigger efficiency and hope it will be helpful for the trigger table design.