高能物理与核物理
高能物理與覈物理
고능물리여핵물리
HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS
2007年
9期
802-809
,共8页
胡海明%翁瑶%郭义庆%金毅%张丙新%胡君辉%高原宁
鬍海明%翁瑤%郭義慶%金毅%張丙新%鬍君輝%高原寧
호해명%옹요%곽의경%금의%장병신%호군휘%고원저
R值%强子事例%系统误差%事例产生器
R值%彊子事例%繫統誤差%事例產生器
R치%강자사례%계통오차%사례산생기
R value%hadronic event%systematic error%event generator
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.
彊子事例的選擇和彊子探測效率是在BEPC/BES上進行R值測量的兩項主要誤差來源.過去實驗隻選取等于或者大于2扠的彊子事例,因而0扠和1扠事例的丟失將導緻彊子事例數和彊子探測效率的較大誤差.試圖提齣在R值測量中選取包含1扠彊子事例在內的樣本,這將有助于更閤理地調節彊子事例產生器LUARLW的參數,減小彊子探測效率和R值測量的繫統誤差.
강자사례적선택화강자탐측효솔시재BEPC/BES상진행R치측량적량항주요오차래원.과거실험지선취등우혹자대우2차적강자사례,인이0차화1차사례적주실장도치강자사례수화강자탐측효솔적교대오차.시도제출재R치측량중선취포함1차강자사례재내적양본,저장유조우경합리지조절강자사례산생기LUARLW적삼수,감소강자탐측효솔화R치측량적계통오차.
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 O-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.
