Top quark mass measurements at the t (t)over-bar threshold with CEPC

被引：0
|
作者：
Li, Zhan [1 ,2 ]
Sun, Xiaohu [3 ,4 ]
Fang, Yaquan [1 ,2 ]
Li, Gang [1 ,2 ]
Xin, Shuiting [1 ,2 ]
Wang, Shudong [1 ,2 ]
Wang, Yiwei [1 ,2 ]
Zhang, Yuan [1 ,2 ]
Zhang, Hao [1 ,2 ,5 ]
Liang, Zhijun [1 ,2 ]
机构：
[1] Inst High Energy Phys, 19B Yuquan Rd, Beijing 100049, Peoples R China
[2] Univ Chinese Acad Sci CAS, 19B Yuquan Rd, Beijing 100049, Peoples R China
[3] Peking Univ, Dept Phys, 209 Chengfu Rd, Beijing 100871, Peoples R China
[4] Peking Univ, State Key Lab Nucl Phys & Technol, 209 Chengfu Rd, Beijing 100871, Peoples R China
[5] Peking Univ, Ctr High Energy Phys, 209 Chengfu Rd, Beijing 100871, Peoples R China
来源：
EUROPEAN PHYSICAL JOURNAL C | 2023年 / 83卷 / 04期
基金：
美国国家科学基金会;
关键词：
HEAVY QUARKS; PAIR;
D O I：
10.1140/epjc/s10052-023-11421-1
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We present a study of top quark mass measurements at the t (t) over bar threshold based on CEPC. A centre-of-mass energy scan near two times of the top quark mass is performed and the measurement precision of top quark mass, width and alpha(S) are evaluated using the t (t) over bar production rates. Realistic scan strategies at the threshold are discussed to maximise the sensitivity to the measurements individually and simultaneously in the CEPC scenarios assuming a total luminosity limited to 100 fb(-1). With the optimal scan for individual property measurements, the top quark mass precision is expected to be 9 MeV, the top quark width precision is expected to be 26 MeV, and alpha(S) can be measured at a precision of 0.00039, considering only the statistical uncertainty. Taking into account the systematic uncertainties from theory, width, alpha(S), experimental efficiency, background subtraction, beam energy and luminosity spectrum, the top quark mass can be measured at a precision of 25 MeV optimistically and 59 MeV conservatively at CEPC.
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页数：11
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