Research PaperOpen Access

Performance study of the relative decay width measurement in hadronic decays of $Z$ boson at CEPC by using the template method

Bo Li

https://orcid.org/0000-0002-2994-3382

College of Nuclear Equipment and Nuclear Engineering, Yantai University, No. 30 Qingquan Road, Yantai 264005, China

E-mail Address: boli@ytu.edu.cn

Corresponding author.

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Yanyan Du

College of Nuclear Equipment and Nuclear Engineering, Yantai University, No. 30 Qingquan Road, Yantai 264005, China

E-mail Address: duyy@ytu.edu.cn

Corresponding author.

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Zhijun Liang

Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

E-mail Address: liangzj@ihep.ac.cn

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, and

Bo Liu

Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

E-mail Address: boliu@cern.ch

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https://doi.org/10.1142/S0217751X21502079Cited by:2 (Source: Crossref)

Abstract

The Circular Electron Positron Collider (CEPC) was proposed by the Chinese particle physics scientists as a future Higgs factory and $W / Z$ factory. It will produced more than $1 0^{12}$ $Z$ bosons by operating at a center-of-mass energy around 91.2 GeV in two years. In this study, the measurement of the relative decay widths of $Z$ bosons decaying to $b$ quarks $(R_{b})$ , $c$ quarks $(R_{c})$ and light quarks $(R_{u d s})$ in hadronic $Z$ decays are studied on CEPC Monte Carlo (MC) samples. By using a template method, $R_{b}$ , $R_{c}$ and $R_{u d s}$ can be fitted from reconstructed data as the fractions of MC templates with different flavors. The distribution of a sensitive variable, $b$ -tagging probability, is used as the template, because of its high performance in discriminating different flavors. Based on the expected statistics of $1 0^{12}$ $Z$ bosons at CEPC, the statistical uncertainty is estimated to be approximately $1 0^{- 6}$ by using the template method, which means that the measurement will no longer be limited by the statistics. Systematic errors arise directly from the difference in the $b$ -tagging probability distribution between real data and template MC samples. By considering the bias of input variables used for $b$ -tagging probability computing, the quantitative effect for each kind of input variable is investigated by using an ensemble test procedure.

Keywords:

PACS: 12.15.−y, 13.38.DG, 14.70.HP

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Vol. 36, No. 27

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History

Received 12 May 2021

Revised 2 September 2021

Accepted 22 September 2021

Published: 12 October 2021

Information

This is an open access article published by World Scientific Publishing Company. It is distributed under the terms of the Creative Commons Attribution 4.0 (CC BY) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Performance study of the relative decay width measurement in hadronic decays of Z<math altimg="eq-00001.gif" display="inline"><mi>Z</mi></math> boson at CEPC by using the template method

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Performance study of the relative decay width measurement in hadronic decays of $Z$ boson at CEPC by using the template method