https://doi.org/10.1140/epjc/s10052-025-14689-7
Regular Article - Experimental Physics
Measurement of the effective weak mixing angle using 
, 
and 
final states at the CEPC
1
Department of Modern Physics, University of Science and Technology of China, 230026, Hefei, China
2
Institution of High Energy Physics, Chinese Academy of Sciences, 100049, Beijing, China
Received:
17
October
2024
Accepted:
28
August
2025
Published online:
15
September
2025
The proposed Circular Electron Positron Collider (CEPC) is expected to provide adequate events around the Z boson mass pole, allowing high precision determination on the effective weak mixing angle. Specifically, one can acquire large data samples of the 
, 
and 
events with high purity, even though the efficiencies of the jet tagging are limited to ensure a good separation between different flavors. According to recent studies of the detector and reconstruction algorithms, with the new jet tagging method at the CEPC detector which gives a purity of 
for the and samples and 
for the sample, the corresponding uncertainties on the effective weak mixing angle determined from those samples are better than 
using data collected within 1 month. It allows high precision determinations of the effective weak mixing angle from different quark flavors especially for c and s quarks, which is essential to the standard model global test and potential new physics searches.
© The Author(s) 2025
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