超级陶粲装置上的Collins效应  

Collins effect at super tau-charm facility

作　　者：王滨龙 吕晓睿 郑阳恒 WANG Binlong;LÜXiaorui;ZHENG Yangheng(University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院大学物理科学学院,北京100049

出　　处：《中国科学院大学学报（中英文）》2021年第4期433-441,共9页Journal of University of Chinese Academy of Sciences

基　　金：国家自然科学基金(11822506);中央高校基本科研业务费专项资金资助。

摘　　要：超级陶粲装置(STCF)是未来计划的高亮度正负电子对撞机,将是目前正在运行的北京正负电子对撞机对撞亮度的100倍。利用亮度为2.5 fb-1质心能量在7 GeV的e+e-→q q-模拟样本,研究STCF实验上电子湮灭产生单举带电π介子对或带电K介子对的Collins不对称度测量的精度。在预期积分亮度为1 ab-1(预期在STCF上采集一年的数据量)的情况下,预计ππX过程的Collins不对称度测量精度为10-4量级,KKX的测量精度为10-3量级。研究发现测量的不对称度的系统误差受本底水平与K-π误鉴别影响很大,因此在未来的STCF实验上采用契伦科夫探测器提高高动量的K-π鉴别能力对提高Collins碎裂函数测量精度极为重要。The super tau-charm facility is a future project of high luminosity electron-positron collider,which will achieve the luminosity of 100 times of the current running facility BEPCⅡin Beijing.In this work,we present a sensitivity study on the Collins asymmetry measurement of e+e-→ππX and KKX using 2.5 fb-1 e+e-→q q-Monte Carlo simulation sample generated at the center-of-mass energy of 7 GeV.Extrapolating to the integrated luminosity of 1 ab-1,the statistical sensitivities of the Collins asymmetries of chargedππpairs are at the level of 10-4,while for the charged KK pairs,the sensitivities are in the range of 10-3.Research shows that the accuracy of the asymmetry measurement is affected to a large extent by the background level(mostly from weak processes)and K-πmisidentification.So an improved particle discrimination power using Cherenkov detector is very important for this project.

关 键 词：正负电子对撞机 超级陶粲装置 碎裂函数 Collins不对称度 

分 类 号：Q572.214[生物学—生物化学]