Top quark mass measurements at the threshold with CEPC

Zhan Li; Xiaohu Sun; Yaquan Fang; Gang Li; Shuiting Xin; Shudong Wang; Yiwei Wang; Yuan Zhang; Hao Zhang; Zhijun Liang

doi:10.1140/epjc/s10052-023-11421-1

2024 Impact factor 4.8

Particles and Fields

Open Access

This article has an erratum: [https://doi.org/10.1140/epjc/s10052-023-11650-4]

Eur. Phys. J. C (2023) 83: 269
https://doi.org/10.1140/epjc/s10052-023-11421-1

Regular Article - Experimental Physics

Top quark mass measurements at the $t \bar{t}$ $t\bar{t}$ threshold with CEPC

Zhan Li¹^,2, Xiaohu Sun³^b, Yaquan Fang¹^,2, Gang Li¹^,2, Shuiting Xin¹^,2, Shudong Wang¹^,2, Yiwei Wang¹^,2, Yuan Zhang¹^,2, Hao Zhang¹^,2^,4 and Zhijun Liang¹^,2

¹ Institute of High Energy Physics, 19B, Yuquan Road, Shijingshan District, 100049, Beijing, China
² University of Chinese Academy of Sciences (CAS), 19A, Yuquan Road, Shijingshan District, 100049, Beijing, China
³ Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, 209 Chengfu Road, Haidian District, 100871, Beijing, China
⁴ Center for High Energy Physics, Peking University, 209 Chengfu Road, Haidian District, 100871, Beijing, China

^b Xiaohu.Sun@pku.edu.cn

Received: 15 August 2022
Accepted: 17 March 2023
Published online: 1 April 2023

Abstract

We present a study of top quark mass measurements at the $t \bar{t}$ $t\bar{t}$ 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 $α_{S}$ $\alpha _S$ are evaluated using the $t \bar{t}$ $t\bar{t}$ 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 $^{- 1}$ $^{-1}$ . 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 $α_{S}$ $\alpha _S$ can be measured at a precision of 0.00039, considering only the statistical uncertainty. Taking into account the systematic uncertainties from theory, width, $α_{S}$ $\alpha _S$ , 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.

The original online version of this article was revised: The affiliation details for the first affilation were incorrectly given as ‘Institute of High Energy Physics, 19B, Yuquan Road, Shijing District, Beijing 100049, China’ but should have been ‘Institute of High Energy Physics, 19B, Yuquan Road, Shijingshan District, Beijing 100049, China’. The affiliation details for the second affilation were also incorrectly given as ‘University of Chinese Academy of Sciences (CAS), 19B, Yuquan Road, Shijing District, Beijing 100049, China’ but should have been ‘University of Chinese Academy of Sciences (CAS), 19A, Yuquan Road, Shijingshan District, Beijing 100049, China’.

An erratum to this article is available online at https://doi.org/10.1140/epjc/s10052-023-11650-4.

Copyright comment corrected publication 2023

Erratum to this article: https://doi.org/10.1140/epjc/s10052-023-11650-4

© The Author(s) 2023. corrected publication 2023. corrected publication 2023

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