超级陶粲装置上的Collins效应

doi:10.7523/j.issn.2095-6134.2021.04.001

中国科学院大学学报 ›› 2021, Vol. 38 ›› Issue (4): 433-441.DOI: 10.7523/j.issn.2095-6134.2021.04.001

• 前沿创新 • 下一篇

超级陶粲装置上的Collins效应

王滨龙, 吕晓睿, 郑阳恒

中国科学院大学物理科学学院, 北京 100049

收稿日期:2020-05-06 修回日期:2020-05-25 发布日期:2021-07-10
通讯作者: 吕晓睿
基金资助:
国家自然科学基金（11822506）和中央高校基本科研业务费专项资金资助

Collins effect at super tau-charm facility

WANG Binlong, Lü Xiaorui, ZHENG Yangheng

University of Chinese Academy of Sciences, Beijing 100049, China

Received:2020-05-06 Revised:2020-05-25 Published:2021-07-10

摘要/Abstract

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^-→qq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。

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

Abstract: 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 BEPCⅡ in 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^-→qq 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 charged ππ pairs 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-π misidentification. So an improved particle discrimination power using Cherenkov detector is very important for this project.

Key words: electron-positron collider, super tau-charm facility, quark fragmentation function, Collins asymmetry

中图分类号:

Q572.214

王滨龙, 吕晓睿, 郑阳恒. 超级陶粲装置上的Collins效应[J]. 中国科学院大学学报, 2021, 38(4): 433-441.

WANG Binlong, Lü Xiaorui, ZHENG Yangheng. Collins effect at super tau-charm facility[J]. Journal of University of Chinese Academy of Sciences, 2021, 38(4): 433-441.

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超级陶粲装置上的Collins效应

Collins effect at super tau-charm facility

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