R值测量中强子事例选择的改进(英文)  

Improvement on Hadronic Event Selection in R Measurement

作　　者：胡海明[1] 翁瑶[1] 郭义庆[1] 金毅[1] 张丙新[1] 胡君辉[1] 高原宁[2] 

机构地区：[1]中国科学院高能物理研究所,北京100049 [2]清华大学工程物理系,北京100084

出　　处：《高能物理与核物理》2007年第9期802-809,共8页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(10491300)资助~~

摘　　要：强子事例的选择和强子探测效率是在BEPC/BES上进行R值测量的两项主要误差来源.过去实验只选取等于或者大于2叉的强子事例,因而0叉和1叉事例的丢失将导致强子事例数和强子探测效率的较大误差.试图提出在R值测量中选取包含1叉强子事例在内的样本,这将有助于更合理地调节强子事例产生器LUARLW的参数,减小强子探测效率和R值测量的系统误差.Hadronic event selection and hadronic detection efficiency are two main sources of systematic error for the R measurement at BES/BEPC. If only the hadronic events with 2-prong and higher prong are selected as done in the previous measurements, the lost events with 0-prong and 1-prong will cause the systematic error for both of the number of hadronic events and the detection efficiency. This paper aims to present a new method to select the 1-prong hadronic events. It will be helpful to tune the parameters in hadronic events generator LUARLW more reasonably, and decrease the systematic errors of hadronic efficiency in R measurement.

关 键 词：R值 强子事例 系统误差 事例产生器 

分 类 号：O572[理学—粒子物理与原子核物理]