摘要
基于BESⅢ离线软件系统BOSS6.3.4,研究J/Ψ衰变到μ+μ-的事例挑选、探测效率以及本底估计,并用此过程来确定BESⅢ上J/Ψ总数。实验结果显示:用这种方法能得到事例选择效率为55.55%;得到的探测效率与硬件结构相符合;很好地将来自J/Ψ衰变的本底压低,提供了估计QED本底的方法;最后得到蒙特卡罗样本的输入与输出差别为0.08%。以上结果说明该方法适合精确地确定BESⅢ上高统计量的J/Ψ总数。
The events selection,detecting efficiency,and background estimation are studied in the process of J/ψ decaying to μ+μ-at,based on BES Ⅲ offline software system (BOSS)6. 3. 4 version. It is used to determine J/ψ total number at BES Ⅲ. The results show that the events selection efficiency is 55.55% ,and the detecting efficiency accords with the hardware structure. The background from J/ψ decay is low and a method is provided to estimate the QED background. The difference between the input and output of Monte Carlo sample is 0. 08%. These indicate that this method can be used to precisely determine the total number of J/ψ with high statistical sample at BES Ⅲ.
出处
《广西师范大学学报(自然科学版)》
CAS
北大核心
2009年第3期14-17,共4页
Journal of Guangxi Normal University:Natural Science Edition
基金
国家自然科学基金资助项目(10865002)
广西研究生教育创新计划资助项目(2008106020702M238)