Title | Top quark mass measurements at the t (t)over-bar threshold with CEPC |
Authors | Li, Zhan Sun, Xiaohu Fang, Yaquan Li, Gang Xin, Shuiting Wang, Shudong Wang, Yiwei Zhang, Yuan Zhang, Hao Liang, Zhijun |
Affiliation | Inst High Energy Phys, 19B Yuquan Rd, Beijing 100049, Peoples R China Univ Chinese Acad Sci CAS, 19B Yuquan Rd, Beijing 100049, Peoples R China Peking Univ, Dept Phys, 209 Chengfu Rd, Beijing 100871, Peoples R China Peking Univ, State Key Lab Nucl Phys & Technol, 209 Chengfu Rd, Beijing 100871, Peoples R China Peking Univ, Ctr High Energy Phys, 209 Chengfu Rd, Beijing 100871, Peoples R China |
Keywords | HEAVY QUARKS PAIR |
Issue Date | 1-Apr-2023 |
Publisher | EUROPEAN PHYSICAL JOURNAL C |
Abstract | 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. |
URI | http://hdl.handle.net/20.500.11897/683893 |
ISSN | 1434-6044 |
DOI | 10.1140/epjc/s10052-023-11421-1 |
Indexed | SCI(E) |
Appears in Collections: | 物理学院 其他实验室 核物理与核技术国家重点实验室 |